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HomeMy WebLinkAbout1.11 ClimateDivision of Reclamation Mining & Safety Permit Application RTZ INDUSTRIAL SAND & GRAVEL MINING OPERATION GARFIELD COUNTY, COLORADO 8.4.19 - EXHIBIT K — Climate Climatological data for the nearest municipality to the RTZ Industrial site (Parachute, CO) are not available. Data are attached for the two stations on either side of the RTZ site: Grand Junction (33 miles southwest of the site) and Rifle (98 miles east of the site). U.S. Department of Commerce l National Oceanic & Atmospheric Administration I NOAA Research Climatology for Grand Junction CO Lat =39.1 N Lon= 108.3W Elevation =4848 feet Number of years available from 1961 to 1990: 30 Maximum ternperalure 1961 to 1990: 105 F Minimum temperature 1961 to 1990. -23 F Mean Annual Precipitation: 8.7 inches Mean Annual Snowfall: 24.1 inches Ooily mean maximum temperature and extremes: Grand Junction CO s t C Q lL N a a `v+ v C] - ___— _____ —r____ D D u W a D 0 AN FEB MAR APR IrAY JUN JUL AIjC. SiP OCT AirJ+I DEC •� Vt} L Ll6 C 70 di W s` 50 o so Ld aD to QI v 1 Ili D -tD y -2D Cj -30 Day [wily mean minimum temperature and extremes: Grand Junction CO NN VC. Doy Daily mean precipitation and . snowfall: Grand Junction CO C L 40 IU L .L L m•er siwx U IFl Ony '0. WAM„CIRES/Climate Diagnm ice center Daily % chance precipilation,w nd speed and % sunshine Monthly anomalies 1961 -1990 Monthly means 1961 -1990 W.S.. Deparlmeol of Commerce i National Oceanic and Almospheric Administration Earth System Research Laboratory I Physical Sciences Division Current page: hap,Anm cdc.ncpaa gc vitW- &j1AjSCh1nateldty p1 Privacy Poky I Accessibility i Disclaimer Contact the Webma5ter (webmaster psdiLDnoaa gov) . of 1 6120/2047 4.59 1'M .�..........e, ✓au•- -VA ti... U.S. Department of Commerce l National Oceanic B Atmospheric Administration I NOAA Research Grand Junction GO chance precip, wind speed and sunshine Lat= 39.1 N Lon= 108.3W Elevation =4848 feet Number of years available from 1961 to 1990: 30 Annual average chance of precipitation: 19.8 %% Annual average wind speed: 8.1 mph Annual average percent of available sun: 70.4°1 Daily Chance of Precipitation Grand Junction CO top _ ___...... _. 91) 0. 84 �4 ar v 54 a 14 24 14 aG i 41 Q. dl G C U CL Month Average wired speed (aver 7 years) Month Percent of passible sun (over 7 years) 0 i4 S6 p 4 ,AN F AIAR RPR t1AY AN JUL AUG YP t7�i N@1 4EC ManMO4w- ORES /Gllma4a Drcgnoatka CanRrr U.S. Departilneni of CornrnarCe I Nalional Oceanic and AtmosphericAdminislration Earth System Research Laboratory I Physical Sciences Division Current page: help:lAvww. ode .noaa.govk:gi- bWUSchmatelcrly. pl Privacy Policy I Accessibifity I Disclaimer Contact the Webmaster (webmas$&r.psdQn0 aa.govt of 1 6120/2047 4:58 PM Notes a. The monthly means are simple arithmetic averages computed by summing the monthly values for the period 1971 -2000 and dividing by thirty. Prior to averaging. the data are adjusted if necessary to compensate for data quality issues, station moves or changes in station reporting practices. Missing months are replaced by estimates based on neighboring stations. b. The median is defined as the middle value in an ordered set of values. The median is being provided for the snow and precipitation elements because the mean can be a misleading value for precipitation normals. c. Only observed validated values were used to select the extreme daily values. d. Extreme monthly temperature /precipitation means were selected from the monthly normals data. Monthly snow extremes were calculated from daily values quality controlled to be consistent with the Snow Climatology. e. Degree Days were derived using the same techniques as the 197I -2000 normals. Compete documentation for the 1971 -2000 Normals is available on the intemet from: www.ncdc.tioaa.gov/oa/climate/normals/usnormals-html f. Mean "number of days statistics" for temperature and precipitation were calculated from a serially complete daily data set . Documentation of the serially complete data set is available from the link below: g. Snowfall and snow depth statistics were derived from the Snow Climatology. Documentation for the Snow Climatology project is available from the link under references. Data Sources for Tables Several different data sources were used to create the Clim20 climate summaries. In some cases the daily extremes appear inconsistent with the monthly extremes and or the mean number of days statistics. For example, a high daily extreme value may not be reflected in the highest monthly value or the mean number of days threshold that is less than and equal to the extreme value. Some of these difference are caused by different periods of record. Daily extremes are derived from the station's entire period of record while the serial data and normals data were are For the 1971 -2000 period. Therefore extremes observed before 1971 would not be included in the 1971 -2000 normals or the 1971 -2000 serial daily data set. Inconsistencies can also occur when monthly values are adjusted to reflect the current observing conditions or were replaced during the 1971 -2000 Monthly Normals processing and are not reconciled with the Summary of the Day data. a. Temperature/ Precipitation Tables c. Snow Tables 1. 1971 -2000 Monthly Normals 1. Snow Climatology 2. Cooperative Summary of the Day 2. Cooperative Summary of the Day 3. National 'Weather Service station records 4. 1971 -2000 serially complete daily data d. Freeze Data Table 1971 -2000 serially complete daily data b. Degree Day Table 1. Monthly and Annual Heating and Cooling Degree Days Normals to Selected Bases derived from 1971 -2000 Monthly Normals 2. Daily Normal Growing Degree Units to Selected Base Temperatures derived from 1971 -2000 serially complete daily data References U.S. Climate Normals 1971 -2000, 4v <.•w.ncdc.noaa.Qov /normals.htmI U.S. Climate Normals 1971 - 2000 - Products Clim20, v<-Anv. ncdc. noaa. eov /oa/ climate /normalslusnonnalsnrods.html Snow Climatology Project Description, w%vw.ncdc.noaa goa'1oalcUmate/monitorin snowcIitnhnainyaM.htmI Eischeid, J. K., P. Pasteris, H. F. Diaz, M. Plantico, and N. Lott, 2000: Creating a serially complete, national daily time series of temperature and precipitation for the Western United States. J. Appl. Meteorol., 39, 1580 -1591, wwwi.ncdc.noaa.gov /pub /data /special/ serialcomplete _jam_0900.pdf U.S. Dew^ -tment of Commerce Nati -eanic & Atmospheric Administration Nation.. Environmental Satellite, Data, and information Service Station: RIFLE, CO Climate Division: CO 2 NWS Call Sign: Climatogr shy of the Unit" States No. 20 1971 -2000 National Climatic I'-+1 Center Federal Building 151 Patton Avenue Ashevillc, forth Carolina 28801 www.ncdc.noaa.gor COOP 10: 457031 Elevation: 5,450 Feet Lat: 39'32N Lan: 107'48W Degree Days to Selected Base Temperatures ('F) Base Heating Degree Days to Below Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 65 1287 959 783 544 292 81 10 19 162 486 874 1223 6720 60 1132 819 628 397 165 26 1 2 73 335 724 1068 5370 57 1039 735 535 314 105 10 0 0 39 251 634 975 4637 55 977 679 474 261 74 5 0 Q 24 199 574 1 913 4180 5o 822 543 329 1 151 1 24 1 0 1 0 0 1 4 1 95 1 426 758 3152 32 335 1 150 1 24 j 0 1 0 0 0 1 0 0 1 52 259 1 822 Base Coaling Degree Days (1) Above Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 32 71 115 265 448 737 988 1209 1165 863 538 167 59 6525 55 0 0 1 18 98 303 496 452 196 24 0 0 15$8 57 0 0 0 10 68 248 434 390 I52 13 0 0 1315 60 0 Q 0 4 34 174 341 299 96 4 0 0 952 65 0 0 0 0 7 79 195 161 1 34 0 1 0 0 476 7❑ ❑ Q 0 0 0 24 82 61 7 0 0 D 174 (1) Derived from the 1971 -2000 Monthly Normals Complete documentation available from,: (2) Derived from 1971 -2000 serially complete daily data wrvw. ncdc. noaa. gov/ oa /climate/normal.Vusnormals.html Note: For corn, temperatures below 50 are set to 50, and temperatures above 86 are set to 86 084-E Growing Degree Units (2) Base Growing Degree Units (Monthly) Growing Degree Units (Accumulated Monthly) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep I Oct Nov Dec 40 0 12 90 249 499 751 966 918 628 309 43 0 0 12 102 351 850 160I 2567 3485 4113 4422 4465 4465 45 0 2 28 134 350 601 sit 763 478 180 10 0 0 2 30 164 514 1115 1926 2689 3167 3347 3357 3357 So Q D 3 53 211 453 656 608 333 79 0 0 0 0 3 56 267 720 1376 1984 2317 2396 2396 2396 55 0 D 0 I4 101 308 501 453 198 18 0 0 0 0 0 14 115 423 924 7 1575 1593 1593 1593 60 0 0 D 0 28 175 346 294 86 i 0 0 0 D D 0 28 203 549 �84 934 935 935 935 Base Growing Degree Units for Corn (Monthly) Growing Degree Units for Corn (Accumulated Monthly) 50186 D 28 117 222 365 496 6Q4 580 438 286 70 1 5 0 2a 148 367 732 1228 I832 2412 2850 3136 3206 3211 (1) Derived from the 1971 -2000 Monthly Normals Complete documentation available from,: (2) Derived from 1971 -2000 serially complete daily data wrvw. ncdc. noaa. gov/ oa /climate/normal.Vusnormals.html Note: For corn, temperatures below 50 are set to 50, and temperatures above 86 are set to 86 084-E U.S. Departm• `_`ommrrc< National Oct Atmospheric Administration National Environmental Satellite, Data, acid Information Service Station: RIFLE, CO Climate Division: CO 2 NWS Call Sign: Cumat aphy of the United States No. 20 1971 -2000 Natk 'imatir Data Center Feder . .gilding 151 Patton Avenue Asheville, North Carolina 28801 www,ncdc.noaa.gov COOP ID: 057031 Elevation: 5450 Feet Lat. 39 °32N Lon: 107'48W Freeze Data Spring Freeze Dates (Month/Day) Temp (Ii) Probability of later date in spring (thru Jul 31) than indicated( *) .10 .20 30 .40 .50 .60 .70 Ao 9D 36 6124 6119 6115 6112 6109 6105 6/02 5129 5124 32 6113 6107 6102 5129 5125 5122 5118 5113 5107 28 5125 5120 5115 5112 5108 5105 5101 4127 4123 24 5107 5101 4/27 4123 4120 4116 4113 4108 4102 20 4125 4119 4115 4111 4108 4104 3131 3127 3121 16 4111 4104 3130 3125 3121 3117 3112 3107 2128 Fall Freeze Dates (Month/Day) Temp (F) Probability of earlier date in fall (beginning Aug 1) than indicated( *) .10 .20 30 .40 .30 .60 .70 .80 .90 36 8131 9105 9109 9112 9115 9118 9121 9125 9130 32 9112 9116 9/19 9122 9124 9126 9129 10102 10106 28 9120 9125 9128 10167 10103 10/06 €0109 10112 10/17 24 9128 10104 10109 10112 10116 10120 10123 14128 €1103 20 1011fi 74120 10124 10/27 €0129 11 /01 €1/04 11107 11 /12 16 10125 1 10130 1 11 /02 1 11105 11108 1 11!11 1 11114 1 11118 €1122 Freeze Free Period Temp (F) Probability of longer than indicated freeze free period: (Days) .10 .20 30 .40 .50 .50 .70 .so .90 36 118 111 106 102 98 94 89 84 77 32 I43 136 130 125 121 117 112 106 99 28 172 163 157 152 147 143 137 131 123 24 204 195 189 184 178 173 168 162 153 20 227 219 213 208 204 199 195 189 181 16 257 248 242 236 231 226 221 2 €4 205 * Probability of observing a temperature as cold, or colder, later in the spring or earlier in the fall than the indicated date. 0/00 Indicates that the probability of occurrence of threshold temperature is less than the indicated probability. Derived from 1971 -2000 serially complete daily data Complete documentation available from: www.ticde. noaa.gov /oa: elimatelnormalsiusnalmals.htmI 484 -D LS. Dep; , of Commerce National Gt,Anic & Atmospheric Administration National Environmental Satellite. Data, and Information Services Station: RIFLE, CO Climate Division: CO 2 Climat, aphy of the United States No. 20 1971 -2000 NWS Cali Sign: Elevation: 5,450 Feet Snow (inches) National Climatic I :rater Federal Building 151 Patton Avenue Asheville, North Carotins 28801 www.pcdc.noan.gav COOP ID: 057031 Lat. 39932N Lon: 107 °48W + Also occurred on an earlier date(s) #Denotes trace amounts nC, Denotes mean number of days greater than 0 but less than .05 - 91 -9.9 represents missing values Annual statistics for Mean/Median snow depths are not appropriate 084 -C (1) Derived from Snow Climatology and 1971 -2000 daily data (2) Derived from 1971 -2000 daily data Complete documentation available from: www.nedc.noaa.gov/oa/climate/normals,'usnorrnals.htm] Snow Totals Mean Number of Days m Snow Fall Snow Depth Means/Medians (l) Extremes (2) >- 'Thresholds >= Thresholds highest Highest highest Highest Snow Snow Snow Snow Dally Monthly Daily Monthly Month Fall Fall Fa$ Depth Depth P Year Day Yen r Year Day ]Mean Year 0.1 1.0 3.4 5.0 1010 1 3 5 10 ]Mean Median Mean Median Snow Snow Scow SpOW Fall Fail Depth Depth Jan 12.9 11.0 5 3 10 -0 1974 5 35.7 1988 20 1975 8 15 1979 6.4 4.4 1.7 -8 CO, 19.4 153 115 5.7 Feb 7.8 7 -0 3 1 16.7 1989 4 35 -6 1989 25 I979 2 16 1979 4 -4 3 -0 1.0 .4 @? 10.8 7.9 6 -7 2 -2 Mar 3 -9 2 -0 q I # 8.0 1985 27 25.0 1985 10 1985 29 2 1979 2.4 1.4 .4 .2 .0 1.5 -6 .4 @ Apr .6 .0 # 0 3.0 1983 3 4.7 1975 1 1999 3 #+ 2000 .7 .2 @ -0 -0 -2 .0 .0 0 May # -0 # 0 # 1979 7 1 1979 # 1999 10 # ]999 -o .0 .0 .0 .0 .0 .0 -0 -0 ,inn # A 0 0 # 1976 14 # 1976 0 0 0 0 0 .0 .0 .0 ,0 .0 .0 .0 .0 0 Jul .0 _0 0 0 .0 0 0 .0 0 0 0 0 0 0 .0 .0 .0 _0 .0 0 .D 0 U Aug .0 .0 ❑ U .0 0 0 -0 0 0 0 0 0 0 .0 .0 _0 .0 .0 .0 .0 .0 .0 Sep -0 A 0 0 .0 0 0 .0 0 0 ❑ 0 0 0 _0 -0 -❑ a .0 .0 U -0 .0 Oct 1.1 .0 # 0 4.5 1972 29 5.5 1972 5 1972 31 1 1972 .5 A .2 -0 .0 .4 1 .2 1 .0 Nov 5 -0 3.0 # # 1Z.0 1985 9 28 -0 1985 6 1975 27 1 1994 2,7 1.9 .8 -2 @ 12 .9 .2 -0 Dec 12.5 10.7 2 2 11.5 1972 4 38.0 1972 16 1983 28 10 1972 6.2 4.9 1.8 .7 .1 11.4 T2 5.0 1.4 Feb Dec Feb Feb Ana 43.8 33 -7 NJA NIA 16.7 4 38.0 25 2 lfi 23.3 16.2 5.9 2.3 .1 45.9 32 -1 24.9 9.3 1989 1972 1979 1979 + Also occurred on an earlier date(s) #Denotes trace amounts nC, Denotes mean number of days greater than 0 but less than .05 - 91 -9.9 represents missing values Annual statistics for Mean/Median snow depths are not appropriate 084 -C (1) Derived from Snow Climatology and 1971 -2000 daily data (2) Derived from 1971 -2000 daily data Complete documentation available from: www.nedc.noaa.gov/oa/climate/normals,'usnorrnals.htm] U.S. Deµ it of Commerce National Oceanic & Atmospheric Administration National Environmental Satellite, Data, and Information Service Station: RIFLE, CO Climate Division: CO 2 NWS Call Sigh: Climatogri _ y of the United States No. 20 1971 -2000 Elevation: 5,450 Feet Lat: 39 °32N National Climatic Data rr Federal Building 151 Patton Avenue Asheville, North Carolina 28801 www.ncdc.noaa.gov COUP ID: 057031 Lon: 107 °48W Precipitation (inches) Precipitation Totals Mean Number of Days (3) Precipitation Probabilities (I) probability that the monthly /annual precipitation will be equal to or less than the indicated amount Meansl Mediansm Extremes Daily Precipitation MunthlylAnuual Precipitation vs Probability bevels These values were determined Fro m the incomplete gamma distri buti on Month Mean Med- ian nlghdt D"Y(1) Year Day W9bW Mouthly(a) Year L %. t M011"01 Year x 0.01 k 0.10 x 0.50 1.00 .05 1 .I0 .20 .30 .40 .50 .60 .70 .80 .90 .95 Jan _96 .80 1.30 1978 27 150 1980 .13 1994 8.3 3.7 1 @ .17 .25 .39 .52 .66 .80 .97 1.17 1.44 1.87 2.29 Feb 90 .85 1.05 1996 21 145 1996 .05 1972 7.2 31 3 @ .13 .21 .34 .47 .59 .74 .90 1.10 1.37 1.81 2.23 Mar 1.06 95 .92 1912 20 3.04 1985 A6 6 1972 9.8 3.9 .2 .0 20 .29 .44 .59 .73 .89 1.07 1.29 1158 2.04 2.48 Apr 1.11 .89 1.10 1934 3 j 3.29 1999 .08 1982 8.1 4.0 j .4 @ .22 .32 .48 .63 .78 .95 1.13 1.36 j 1.65 2.13 2.58 May 1.18 1.07 1.41 1916 20 322 1979 .00 1974 7.7 18 A .1 .14 .28 .48 .65 .82 1.00 1.21 1.45 1.77 2.29 2.78 Jun 87 .66 1.98 1984 7 3.71 1984 .00 1971 5.5 2.7 .3 .1 .07 .16 .30 .43 .56 .71 .87 1.07 1.35 1.79 2.21 Jul 1.04 .85 1.40 1969 29 2.63 1989 .02 1994 7.0 3.6 .4 @ 13 .21 .36 .50 .66 .83 1.02 1.27 1.60 2.15 2.68 Aug 1.03 .90 2.15 1930 9 2.60 1984 .10 1975 7.3 3.2 .3 .1 .24 .34 49 .62 .76 .90 1.06 1 1.25 1.50 1.90 2.28 Sep 1.21 1.20 1.76 1988 12 130 1986 .07 1979 7.4 4.2 .4 .1 .17 .27 .44 .61 .79 .98 1.20 1.48 1.85 2.46 3.05 Oct 1.31 1.10 1.36 1914 4 3.44 1972 .14 1988 7.2 4.4 .5 .1 .24 35 .54 .72 .90 1.10 1.32 1.59 1.95 2.53 3.08 Nov 1.02 .89 1.21 1919 26 3.59 1985 .00 1976 7.3 16 .1 @ .18 32 .49 .63 .76 .90 1.06 1.25 1.49 1.87 2.22 Dee 1.06 .89 1.42 1966 6 3.25 1978 .02 1976 7.9 3.7 .3 .0 .12 .19 .34 .49 .65 .82 1.03 1.29 1.64 2.22 2.79 Ann 12.75 12.17 115 Aug 1930 9 3.71 Jun 1984 00+ Nov 1976 89.7 419 31 .5 8.08 8.94 10.07 10.94 11.72 12.49 13.28 14.17 15.27 16.87 1827 + Also occurred on an earlier date(s) # Denotes amounts of a trace Denotes mean number of days greater than 0 but less than .05 * Statistics not computed because less than six years out of thirty had measurable precipitation 084 -B (1) From the 1971 -2000 Monthly Normals (2) Derived from station's available digital record: 1910 -2001 (3) Derived from 1971 -2000 serially complete daily data Complete documentation available from. www.ncdc.noaa.gov/oa/climate/normals/uqnormals.html U.S. Department of Comm eret National Oceanic & Atmospheric Administration National Environmental Satellite, Data, and Information Service Station: RIFLE, CO Climate Division: CO 2 NWS Call Sign: Climatography of the United States No. 20 1971 -2000 Temperature ( °F) Elevation: 5,450 Feet Lat: 39'32N €YationaI Climatic Data Center Federal Building 151 Patton Avenue Asheville, :North Carolina 28801 www.ncdc.nona.gov COOP ID: 057031 Lou: 107 °48W + Also occurred on an earlier date(s) G Denotes mean number of days greater than 0 but less than .05 Complete documentation available from: www. ncdc. noaa. guvl na /climate/norrnals/usnorrnals.himI Issue Date: February 2004 084 -A (1) From the 1971 -2000 Monthly Normals (2) Dcrived from station's available digital record: 1910 -2001 (3) Dcrived from 1971 -2000 scrially complete daily data Mean to Extremes Degree Days (1) Rase Temp 65 Mean Number of Days (3) Month Daily Max Daily Min Mean Higknt a :uya] Year Day luckwe Maul €7] Mean Year �"T 02[MZ) Year Day La-n* month([) 1+,'iean Year Heating Coaling Max x tfl0 Max a= 90 Max 7 50 Max C= 32 Min C= 32 Min C= 0 Jan 37.3 9.7 23.5 62 1986 29 31.5 1998 -38 €963 12 13.4 1973 I287 0 .0 .9 2.5 8.0 30.9 6.0 Feb 45.2 163 30.8 69+ €986 26 39.9 1995 -34 1933 10 20.3 1974 959 0 .0 .0 8.8 1.9 27.7 1.8 Mar 55.1 24.4 39.8 79 1986 28 45.5 1999 -16 1948 11 33.6 1975 783 0 .0 .0 21.8 .1 26.8 .0 Apr 63.6 30.1 46.9 92 1936 19 515 €992 7 1945 4 41.3 1975 544 0 .0 @a 27.0 17.7 .0 May 72.7 38.8 55.8 96 2000 30 61. € 2000 17 1972 1 51.2 1975 292 7 .0 .2 30.7 .0 4.5 .0 Jun 841 45.7 65.0 102+ 1994 30 69.3 1988 22 1937 6 60.4 1975 81 79 € 8.5 30.0 .0 .4 .0 Jul 89.6 52.4 71.0 104+ 1931 24 75.4 1998 33 1968 1 67.5 1992 10 195 .7 16.8 31.0 .0 .9 .0 Aug 87,9 51.3 69.6 101+ 2000 10 74.0 2000 31 1960 17 66.2 1975 19 161 .1 12.6 31.0 .0 .0 .0 Sep 79.5 42.0 69.8 99+ €990 14 66.7 1998 21 1937 26 55.8 1971 162 34 .0 1 2.6 30.0 A 12 .0 Oct 67.7 31 .0 49.4 88+ 1992 1 54.1 €988 7 1991 31 44.6 1984 486 0 .0 .0 28.7 .1 18.7 fl Nov 50.5 2 €.2 35.9 79 €934 4 41.8 1999 -16 1955 16 29.7 2000 874 0 .0 1) €5.3 13 28.0 .2 Dec 39.4 11.7 25.6 65+ 1980 3 35.0 1980 -27 1962 26 1510 1978 1223 9 .0 .0 3.7 6.6 30.6 3.9 Ann 64A 31.2 47.8 104+ rnI 1931 24 75-4 Jul 1998 -38 ran 1963 €2 13.4 ran 1973 6720 476 .9 40.7 260.5 18.0 188.5 11.9 + Also occurred on an earlier date(s) G Denotes mean number of days greater than 0 but less than .05 Complete documentation available from: www. ncdc. noaa. guvl na /climate/norrnals/usnorrnals.himI Issue Date: February 2004 084 -A (1) From the 1971 -2000 Monthly Normals (2) Dcrived from station's available digital record: 1910 -2001 (3) Dcrived from 1971 -2000 scrially complete daily data Notes a. The monthly means are simple arithmetic averages computed by summing the monthly values for the period 1971 -2 000 and dividing by thirty. Prior to averaging, the data arc adjusted if necessary to compensate for data quality issues, station moves or changes in station reporting practices. Missing months are replaced by estimates based on neighboring stations. b. The median is defined as the middle value in an ordered set of values. The median is being provided for the snow and precipitation elements because the mean can be a misleading value for precipitation normals. c_ Only observed validated values were used to select the extreme daily values. d. Extreme monthly temperaturelprecipitation means were selected from the monthly normals data. Monthly snow extremes were calculated from daily values quality contro lled to be consistent with the Snow Climatology. e. Degree Days were derived using the same techniques as the 1971 -2000 normals. Compete documentation for the 1971 -2000 Normals is available on the intemct from: www. ncdc .noaa.gOV /Da/climatelnormaisi usnormals.h(m] f. K4can "number of days statistics" for temperature and precipitation were calculated from a serially complete daily data set . Documentation of the serially complete data set is available from the link below: g. Snowfall and snow depth statistics were derived from the Snow Climatology- Documental ion for the Snow Climatology project is available from the link under references. Data Sources for Tables Several different data sources were used to create the Clim20 climate summaries. In some cases the daily extremes appear inconsistent with the monthly extremes and or the mean number of days statistics. For example, a high daily extreme value may not be reflected in the highest monthly value or the mean number of days threshold that is less than and equal to the extreme value. Some of these difference are caused by different periods of record. Daily extremes are derived from the station's entire period of record while the serial data and normals data were are for the 1971 -2000 period. Therefore extremes observed before 1971 would not be included in the 1971 -2000 normals or the I971 -2000 serial daily data set. Inconsistencies can also occur when monthly values are adjusted to reflect the current observing conditions or were replaced during the 1971 -2000 Monthly Normals processing and are not reconciled with the Summary of the Day data. a. Temperature/ Precipitation Tables c. Snow Tables 1. I971• -2000 Monthly Normals 1. Snow Climatology 2. Cooperative Summary of the Day 2. Cooperative Summary of the Day 3. National Weather Service station records 4. 1971 -2000 serially complete daily data d. Freeze Data Table 1971 -2000 serially complete daily data b. Degree Day `fable 1. Monthly and Annual Heating and Cooling Degree Days Normals to Selected Bases derived from 1971 -2000 Monthly Normals 2. Daily Normal Growing Degree Units to Selected Base Temperatures derived from 1971 -7400 serially complete daily data References U.S. Climate Normals 1971 -2000, n�twt•.rm naa.�or ne�rmals.hunl U.S. Climate Normals 1971 -2000- Products Clitn20, +neon .ncd c. noaa. &m4o a., c i m-al c i iwnnaIsi usnormals irods.lttntl Snow Climatology Project Description, wavy. ncdc .noaa.goi, /oak Iimalein ion i ter ing snoi�cIiiWnimnPage,htmI Eischeid, 7. 1C., P. Paste ris, H. F. Diaz, M. Plan Iico, and N. Lott, 2000: Creating a serially complete, national daily time series of temperature and precipitation far the Western United States. 1 Appl. Meteorol., 39, 1580 -1591, www I. ncdc.noaa.govlpub/data/special/ serialcomplete_ jam_0900.pdf U.S. Dea- -tmeat of commerce Natic eanic & Atmospheric Administration Nations. a nvironmental Satellite, Data, and Information Service Station: GRAND JUNCTION WALKER AP, CO Climatogr ihy of the UnitE__ States No. 20 1971 -2000 Climate Division: CO 2 NWS Call Sign: GJT National Climatic Center Federal Building 151 Patton Avenue Asheville North Carolina 29301 www.ncdc.noza.gov COOP ID: 053488 Elevation: 4,858 Feet Lat: 39'08N Lon: 108 °32W Degree Days to Selected Base Temperatures ( °F) Base Heating Degree Days (1) Below Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 65 1194 860 656 409 178 33 12 1 73 367 792 1125 5700 60 1051 727 517 293 91 8 0 0 28 251 657 986 4609 57 965 644 427 221 54 3 0 0 12 180 567 893 3966 55 907 595 370 190 36 1 0 0 6 139 508 831 3573 50 762 464 236 96 1 9 0 0 0 1 61 361 678 2668 32 328 124 l0 0 0 0 0 0 0 0 30 215 707 Base Cooling Degree Days py Above Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 32 46 141 385 601 921 1217 1438 1374 1050 687 241 52 8153 55 0 0 6 61 237 528 725 661 367 85 1 0 2671 57 0 0 3 41 190 469 663 599 312 58 0 0 2335 60 0 0 1 20 126 383 570 506 232 28 0 0 1866 65 0 1 0 1 0 2 44 232 1 394 318 100 1 0 0 1091 70 0 0 0 0 10 130 1 262 204 42 0 0 0 648 (1) Derived from the 1971 -2000 Monthly Normals Complete documentation available from: (2) Derived from 1971 -2000 serially complete daily data www. nede. noaa. govl oa lclimateinonnals/usnormals.html Note: For corn, temperatures below 50 are set to 50, and temperatures above 86 are set to 86 033 -E Growing Degree Units (2) Base Crowing Degree units (Aianthiy) Growing Degree Units (Accumulated Monthly) Jan Feb Mar Apr May Jun in) Aug Sep Oct Nov Dee Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dee 40 1 39 179 377 684 985 1200 1135 820 451 82 3 1 40 219 596 1280 2265 3465 46M 5420 5871 5953 5956 45 0 9 80 248 533 835 1045 980 670 309 31 0 0 9 89 337 870 1705 2750 3730 4400 4709 4740 4740 50 0 0 31 142 382 685 890 825 520 185 7 0 0 0 31 173 555 1240 2130 2955 3475 3660 3667 3667 55 0 0 6 66 244 535 735 670 377 92 0 0 0 0 6 72 316 851 1586 2256 2,633 2725 2725 2725 60 0 0 0 23 131 391 580 515 240 30 0 0 0 0 0 1 23 154 545 1125 1640 1880 1910 1910 1910 Base Growing Degree Units for Corn (Moathly) Growing Degree Emits for Corn (Accumulated Monthly) 50186 0 33 1 126 1 244 1 427 1 628 770 74Q 1 523 286 1 65 3 0 33 159 1 403 1 830 1 1458 1 2228 1 2968 1 3493 1 3777 3842 3845 (1) Derived from the 1971 -2000 Monthly Normals Complete documentation available from: (2) Derived from 1971 -2000 serially complete daily data www. nede. noaa. govl oa lclimateinonnals/usnormals.html Note: For corn, temperatures below 50 are set to 50, and temperatures above 86 are set to 86 033 -E U.S.11epartm Conuverce National Oce. Atmospheric Administration National Envirnmmental Satellite, Data, and information Service Station: GRAND JUNCTION WALKER AP, CO Climate Division: CO 2 NWS Call Sign: GJT Climat aphy of the United States No. 20 1971 -2000 Elevation: 4,858 Feet Nati< i1natic Data Center Feder. .gilding 151 Patton Avenue Asheville. North Carolina 28801 www.ncdc.noaa.gov COOP ID: 053488 Lat: 39'08N Lon: 108'32W Freeze Data Spring Freeze Dates (Month/Day) Temp (F) Probability of later date in spring (thru Jul 31) than indicated( *) .10 .20 .30 AO .50 .60 .70 .80 .90 36 5134 5124 5/19 5116 5/12 5109 5105 5101 4.125 32 5109 5104 5101 4127 4125 4122 4119 4115 4110 28 4/27 4121 4117 4/14 4111 4108 4105 4141 3126 24 41I8 4110 4104 3130 3125 3120 3/15 3109 3101 20 4112 4101 3125 3118 3112 3105 2/27 2119 2/08 16 3128 3/17 3108 3101 2122 2/16 2108 1131 1119 Fall Freeze Dates (Month/Day) Tenup (F} Probability of earlier date in fall (beginning Aug 1) than indicated( *) 10 .20 30 .410 .50 Ae .70 384 .90 36 9124 9129 14103 10/07 10110 10114 10/17 10121 10127 32 9129 10105 10109 10,13 10!16 10120 10124 10128 11103 28 10119 10123 10127 10129 11101 11103 11106 11109 11114 24 10124 1 W29 1 1101 11.104 11107 11/09 11112 11116 W20 20 10130 11105 11110 11114 11118 11121 11125 1I/30 12/07 16 11110 11118 11124 1128 12/03 12107 12/12 12118 I2/26 Freeze Free Period Temp (F) Probability of longer than indicated freeze free period (Days) .10 .20 .3a .40 .50 .60 .70 .80 .90 36 173 165 160 155 Bo 146 141 136 128 32 199 191 184 179 174 169 164 158 149 28 227 219 213 208 203 198 194 188 180 24 256 246 238 232 226 220 214 206 1% 20 290 276 267 258 250 242 234 224 210 16 323 310 299 291 283 1 275 266 256 242 * Probability of observing a temperature as cold, or colder, later in the spring or earlier in the fall than the indicated date. 0100 Indicates that the probability of occurrence of threshold temperature is less than the indicated probability. Derived from 1971 -2000 serially complete daily data Complete documentation available from: www.ncdc.noaa.gov/oa/climate/normals/usnormals.html 043 -D U.S. Depr : Of Commerce National ( - -Aic & Atmospheric Administration National F oviro pirnental Satell ite, Data, and Information Services Station.: GRAND JUNCTION WALKER AP, CO Climate Division: CO 2 NWS Call Sign: GJT CiimaV iphy of the United States No. 20 1971 -2000 Elevation: 4,858 Feet National Climatic C •nter Federal Building 1S1 Patton Avenue Asheville, North Carolina 28801 www.nedc.noaa.gov COOP ID: 053488 Lat: 39'08N Lon: 108'32W Snow (inches) Snow Totals Means Number of Days (1} Snow Fait Snow Depth MeanslMediaas (1) Ex #remes {x} >= Thresholds >= Thresholds Highest Highest Highest Highest Snow Snow Snow Snow Daily Monthly Daily Monthly Month Fall Fall Dc fh P De th p Year 'lay Year Year pay Mean Year 6.1 110 3A 5.0 10.0 1 3 5 10 Mean Median Mean Median Snow Snow Snow Snow Fall Fall Depth Depth Jan 6.0 4.0 2 0 6 -8 1978 23 19.7 1979 11+ 1979 13 8+ 1984 5 -6 2.2 5 1 -0 I3.3 7 -7 5.4 .3 Feb 3.2 2.1 1 0 8.7 1989 4 16.0 1989 11+ 1989 5 7+ 1979 33 1.0 .2 @ -0 7.3 4.9 3 -8 2 Mar 2.8 1 -7 # 0 4.9 2000 20 9.4 1987 5 1979 1 1 1979 2.7 .9 .3 .0 .0 1 -3 .2 [ny .0 Apr 1.5 .2 # 0 53 1975 17 14.3 1975 7 1975 IS # 1997 12 .5 -1 C -0 .3 .1 {a] .0 May -2 .0 # 0 5.0 1979 8 5 -0 1979 1 1979 8 # 2000 _1 .1 @ [uy .0 @ .0 .0 .0 Jun .0 .0 # 0 .0 0 0 .0 0 0 0 0 # 1979 .D .0 .0 A .0 -0 .0 .0 .0 Jul .0 -0 0 0 .0 0 0 -0 0 0 0 0 0 0 .0 .0 .0 -0 .o -0 .0 .0 .0 Aug -0 .0 0 0 _0 0 0 o 0 0 0 0 0 0 .0 .0 .0 -0 .0 .0 -0 .0 .0 Sep 0 -0 0 0 ,0 0 0 .0 0 0 0 0 0 0 .0 .0 .0 _0 -0 .0 .0 -0 .0 Oct -7 .0 # 4 3.4 1972 30 6.1 1975 5 1975 24 # 19% .6 -2 J .0 .0 .2 .1 @ .0 Nov 23 2.0 9 0 4.7 1979 19 82 1979 2+ 1996 16 1 1971 2 -4 .8 -2 -0 .0 1 -1 .0 .0 0 Dcc 4.8 3.6 1 0 6.3 1998 20 19.0 1983 11+ 1983 30 4 I979 ' 4.8 1.8 .2 @ .0 6 -7 2.5 -S -2 Feb Dec Feb Jan Ann 21.5 13.6 NIA N/A 8.7 4 19 -D 11+ 5 8+ 20 -7 7.5 1 -6 .1 .0 30.2 15.5 10.0 7 1989 1983 1989 1984 + Also occurred on an earlier date(s) #Denotes trace amounts Cq? Denotes mean number of days greater than 0 but less than .05 - 91 -9.9 represents missing values Annual statistics for Mean/Median snow depths are not appropriate 043 -C (1) Derived from Snow Climatology and 1971 -2000 daily data (2) Derived from 1971 -2000 daily data Complete documentation available from: www.acdc,nDu.gov/oa/climate/normals/usnormals.html U.S. Dep .t of commerce National Oceanic & Atmospheric Administration National Environmental Satellite, Data, and Information Service Station: GRAND JUNCTION WALKER AP, CO Ctimatogrk y of the United States No. 20 1971 -2000 Climate Division: CO 2 NWS Call Sign: GJT Elevation: 4,858 Feet Lot: 39 a 08N National Climatic Data r Federal Building 151 Patton Avenue Asheville, North Carolina 28801 www.ncdc.noaa.gov COOP ID: 453488 Lon: 108 °32W Precipitation (inches) Precipitation Totals Mears Number of Days (3) Precipitation Probabilities (I) Probability that the monthly /annual precipitation will be equal to or less than the indicated amount !!leans! Medianxi) ]Extremes Daily Precipitation Monthly/Annual Precipitation vs Probability levels These values were determined from the incomplete gamma distribution Month Mean 1Hed- mail tlfern` 1]AWy(2) Year Day niece` menrhrylil Year t°"�'` Hawhry (�) Year x 0.01 x 0.10 x 0.50 x 1.00 .05 .10 .20 .30 A0 .50 .60 .70 .80 .90 .95 .tan 60 52 .64 1956 16 I.36+ 1993 .09 1999 6.6 2.2 .0 .11 .16 25 33 .42 .51 .61 .73 .90 1.17 1.43 Feb 50 _45 .58 1934 9 1.33 1989 .00 1972 5.4 1.5 .1 .0 .04 .10 .18 .26 .33 41 .51 .62 .78 1.02 1.26 Mar I.00 .87 1.02 1918 6 2.02 1979 .02+ 1972 7.8 3.4 .3 .08 .15 .28 .42 .57 .74 .95 1.22 1.58 2.19 2.80 Apr 86 .81 .96 1965 27 2.15 1997 .09 1982 7.1 3.0 .2 .0 .14 22 .34 .46 .58 .71 .87 5.05 1.29 1.69 2.07 May .98 1.10 1.83 1906 24 204 1995 .01 1974 7.1 3.3 2 .0 .10 .17 30 44 .59 .75 .95 1.19 1.53 2.08 2 -62 .tun .41 25 1 1.12 1912 8 1.68 1984 .00 1980 4.0 1.4 I .0 .01 .03 .07 .13 .19 .27 37 .50 .68 .99 1.30 Jul 66 .32 139 1974 18 1.92 1983 '01 1994 5.5 2.1 .2 @ .04 .07 .15 .24 .34 .46 .61 _79 1.05 I.50 1.94 Aug 84 .62 1.43 1921 24 2.67 3997 .09 1975 6.3 2.5 3 .1 .16 23 .35 .47 .58 .71 85 1.02 1.25 1.62 1.96 Sep 91 .63 1.87 1941 22 2.84 1997 .01 1979 6.5 3.0 .4 .0 .OS .14 .26 .38 .52 .68 .87 1.10 1.43 3,98 2.51 Oct 1.00 .90 135 1908 18 3.45 1972 .02 1988 6.2 3.1 A .0 .07 .13 .25 .39 .54 .72 .94 121 140 2.25 2.89 Nov 71 .62 1.08 1919 26 2.00 1983 .00 1989 6.0 2.4 .2 .0 .09 .18 .30 .40 .50 .61 73 .88 1.07 1.38 1.67 Dec .52 .49 1.16 1951 30 1.85 1983 .01 1976 5.6 1.9 .1 .0 .07 .I1 .19 26 .33 .42 .51 .63 .79 I.05 130 Ann 8.99 8.82 1.87 Sep 1941 22 3.45 Oct 1972 .00+ Nov 1989 74.1 29.8 2.5 .1 5.56 ' fi.19 7.01 7.65 8.23 8.79 9.38 10.04 10.85 E2.04 13.08 + Also occurred on an earlier date(s) # Denotes amounts of a trace �u Denotes mean number of days greater than 0 but less than .05 ** Statistics not computed because less than six years out of thirty had measurable precipitation 043 -B (1) From the 1971 -2000 Monthly Normals (x) Derived from station's available digital record: 1900 -2001 (3) Derived from 1971 - 2000 serially complete daily data Complete documentation available from: i,,-ww.incdc.noaa.gov/oa/climate/nomials/usnormals.htmi U.S. Department of commerce National Oceanic & Atmospheric Administration Clima #vgraphy National Environmental Satellite, Data, of the United States and Information Service No. 20 Station: GRAND JUNCTION WALKER AP, CO 1971-2000 Climate Division: CO 2 NWS Call Sign: GJT Temperature ( °F) Elevation: 4,858 Feet Lat: 39'08N National Climatic Data Center Federal Building 151 Patton Avenue Asheville, North Carolina 28801 www.ucdc.noaa.goY COUP ID: 053488 Lon: 108'32W + Also occurred on an earlier date(s) uC, Denotes mean number of days greater than 0 but less than .05 Complete documentation available from: www. ncdc. noaa. gov/ oa lclimatelnormalslusnormals.html Issue Date: February 2004 043 -A (1) From the 1971 -2440 Monthly Normals (2) Derived from station's available digital record: 1900- 2001 (3) Derived from 1971 -2DD0 serially complete daily data Mean (1) Extremes Degree Days (1) Base Temp 65 Mean Number of Days (3) Mouth Daily Max Daily Min Mean tiigbnt ndly{x) Year Day High"[ lYlout�fsl Mean Year Lo ftt 1a■url11 Year Day t,m.est MOa'�E€ Mean Year Heating Cooling Max >.-- 100 Max y= 90 Max 50 Max e= 32 Min e= 32 Min [= 0 Jan 36.6 15.6 26.1 62 1911 31 35.9 1981 -23 1963 13 10.6 1973 1194 0 .0 .0 17 10.0 34.1 3.4 Feb 45.4 22.7 34.1 70 1904 24 410 1995 -21 1933 8 18.7 1974 860 4 _4 .0 9.8 23 24.4 .7 Mar 55.7 31.0 43.4 81+ 1971 26 48.5 1999 5, 1948 11 37.1 1976 656 0 _0 .0 23.8 .I 153 .0 Apr 64.3 37.5 50.9 89+ 1992 30 58.5 1992 11 1975 2 44.5 1975 409 2 .0 .0 28.0 .0 6.1 .0 May 74.5 46.4 60.5 101 2000 29 6518 2000 26 1970 2 54.9 1975 178 44 @ 1.1 34.9 .0 A .0 Jun 86.9 553 71.1 105 1990 27 77.0 €994 34 1976 14 65.3 1975 33 232 1.4 15.4 30.0 .0 .0 .0 Jul 911 61.4 76.8 105+ 1976 10 80.4 1994 44 1993 5 718 1987 12 394 2.8 24.0 31.0 .0 .0 .0 Aug 89.6 59.7 74.7 103+ 3090 2 78.4 28Q0 43 1968 23 71.2 1987 1 318 .7 19.6 31.© .0 Q .0 Sep 80.3 50.4 65.4 100 1995 4 70.0 1998 28 1908 27 60.6 )985 73 100 @ 4.3 30 -0 .0 .2 .0 Oct 66.7 38.6 52.7 88 1963 1 572 1988 16 1917 29 47,9 1984 367 1 .0 .0 29.3 .0 3.5 .0 Nov 49.8 263 38.1 75 1977 5 410 1995 -2 1976 28 31.4 1979 792 0 i .0 .0 15.9 .8 21.9 (a Dec 38.9 17.5 28.2 66 1901 6 38.9 1980 -21 1924 26 14.8 1978 1125 0 A .0 18 6.0 29.8 I.fl Ann 65.1 38.5 51.8 105+ Tun 1990 27 80.4 Jul €994 -23 Jan 1963 13 10.6 San €973 5'760 1091 4.9 64.4 1 265.2 192 132.1 4.7 + Also occurred on an earlier date(s) uC, Denotes mean number of days greater than 0 but less than .05 Complete documentation available from: www. ncdc. noaa. gov/ oa lclimatelnormalslusnormals.html Issue Date: February 2004 043 -A (1) From the 1971 -2440 Monthly Normals (2) Derived from station's available digital record: 1900- 2001 (3) Derived from 1971 -2DD0 serially complete daily data