Climate Summaries for Wyoming as of July 31 2015

Climate Summaries for Wyoming as of July 31 2015

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Riverton Forecast Office has provided the climate data for much of Western Wyoming covering the period through July 2015.


Following are some rainfall totals around Star Valley for July 2015.


Star Valley Ranch            2.62
Bedford                              2.48
2 SE Thayne                      2.05
5  SSE Smoot                     1.86
Afton                                   1.53





Climate Summaries

2014-2015 Water Year Precipitation and Percent of Normal for Selected Stations
Station Name:
Airports		 Drought
Conditions		 Oct
2014		 Nov
2014		 Dec
2014		 Jan
2015		 Feb
2015		 Mar
2015		 Apr
2015		 May
2015		 Jun
2015		 Jul
2015		 Aug
2015		 Sep
2015		 Total for
Water Year
 click on location D0 D1
 for graph D2 D3 D4
Big Piney  D0 0.09 0.05 0.12 0.01 0.05 0.06 0.56 2.30 0.23 1.73 5.20
1981-2010 Normals  0.53  0.21  0.30  0.31  0.35  0.44  0.53  0.84 0.79  0.71  0.69  0.78  5.01
Percent of Normal   17  24  40  3  14 14 106 274 29 244  104
Buffalo None 0.21 0.34 0.08  0.16 0.48 0.08 0.78 5.76 3.23 0.77 11.89
1981-2010 Normals  0.93  0.54  0.40  0.42  0.35  0.92  1.30  2.53  2.28  1.66  0.81  1.31  11.33
  Percent of Normal   23  63  20  38  137 9 60 228 142 46  105
Casper   None 1.05 0.81 1.25 0.52 0.79 0.64 1.66 3.89 1.50 0.57 12.68
1981-2010 Normals  1.11  0.76  0.49  0.51 0.57  0.82  1.29  2.02  1.61  1.41  0.85  1.08  10.59
  Percent of Normal   95  107  255  102 139 78 129 193 93 40  120
Snowfall  3.2  10.6 17.8 6.4  12.4 9.3 4.7 6.3 0.0 0.0 70.7
1981-2010 Normals 7.4  10.3 11.0 9.1 9.8 10.9 11.6 2.9 0.1 0.0 0.0 1.8 73.1
  Percent of Normal   43 103  162  70  127 85 41 217 0 0  97
Evanston   D0 0.11 0.59 0.18 0.64 0.37 0.44 0.57 4.49 0.64 0.88 8.91
  1981-2010 Normals 1.17 1.04 0.58 0.54 0.61 0.86 1.15 1.77 1.24 0.90 0.96 1.31  9.86
  Percent of Normal   9  57  31  119  61 51 50 254 52 98  90
Greybull   None 0.01 0.59 0.21 0.22 0.04 0.14 0.11 1.07 0.25 T 2.64
  1981-2010 Normals  0.60  0.30  0.28  0.23  0.18  0.40  0.71  1.65  1.20  0.66  0.42  0.88  6.21
  Percent of Normal  2 197  75  96 22 35 15 65 21 0 43
Station Name:
Airports		 Drought
Conditions		 Oct
2014		 Nov
2014		 Dec
2014		 Jan
2015		 Feb
2015		 Mar
2015		 Apr
2015		 May
2015		 Jun
2015		 Jul
2015		 Aug
2015		 Sep
2015		 Total for
Water Year
Lander  None 0.50 0.59 1.82 T 1.56 0.55 2.31 6.10 0.80 0.50 14.73
  1981-2010 Normals  1.29  0.86  0.58  0.41  0.58  1.16  1.87  2.20  1.27  0.78 0.61  1.05 11.00
  Percent of Normal   39  69  209  0  269 47 124 277 63 64  134
Snowfall  T  8.9  21.1  0.3  23.6 8.9 10.3 0.8 0.0 0.0 73.9
1981-2010 Normals 9.8  13.1 10.1 7.6 10.3 16.1 16.8 4.8 0.1 0.0 0.0 2.7  88.7
  Percent of Normal   0  68 209  4  229 55 61 17 0 0 83
Riverton  None 0.16 0.42 0.65 0.03 1.04 0.41 0.82 4.55 0.79 1.10  9.97
  1981-2010 Normals  0.89  0.50  0.32  0.24  0.27  0.55  1.30  1.72  1.28  0.89  0.57  0.90  7.96
  Percent of Normal   18  84  203  13  385 75 63 265 62 124 125
Snowfall  17.5  1.5  6.8  0.4  15.8 6.7 3.3 0.5 0.0  0.0  38.8
Rock Springs  None 0.32 0.13 0.11 0.01 0.08 0.22 0.67 3.10 1.11 2.12 7.87
 1981-2010 Normals  0.87  0.49  0.50  0.45  0.48  0.68  0.91  1.21  0.79  0.64  0.62  0.92  7.02
  Percent of Normal  37  27 22  0.4  17 32 74 256 141 331  112
Sheridan   None 0.16 1.49  0.74 0.45 1.28 0.40 1.43 5.42 3.05 0.84 15.26
  1981-2010 Normals  1.41  0.71  0.56  0.56  0.54  0.98  1.60  2.35 2.12  1.18  0.72  1.43 12.01
  Percent of Normal   11  210  132  80  237 41 89 231 144 71  127
Worland None 0.27 0.57  0.70 0.23 0.54 T 0.35 3.06 1.06 0.41  7.19
  1981-2010 Normals 0.69 0.35 0.23  0.23 0.19 0.46 0.86 1.42 1.15 0.71 0.43 0.85  6.29
  Percent of Normal   39  163  304  100  284 0 41 215 92 58  114
Station Name:
COOPS		 Drought
Conditions		 Oct
2014		 Nov
2014		 Dec
2014		 Jan
2015		 Feb
2015		 Mar
2015		 Apr
2015		 May
2015		 Jun
2015		 Jul
2015		 Aug
2015		 Sep
2015		 Total for
Water Year
Afton  D0 0.65 1.56 1.48 0.58 0.88 0.62 1.47 4.84 1.36 1.53 14.97
  1981-2010 Normals 1.63 2.04 1.25 1.40 1.09 1.40 1.54 2.26 1.97 1.43 1.25 1.46 15.45
  Percent of Normal   40 105  118 41  81 44 95 214 69 107 97
Snowfall  0.2  13.9  24.2  9.6  6.5 5.9 6.7 0.0 0.0 0.0 67.0
Bitter Creek 4NE None 0.17 0.53 0.34 0.09 0.13 0.70 0.34 3.82 1.54 2.57 10.21
  1981-2010 Normals 0.66 0.31 0.51 0.28 0.36 0.30 0.65 1.09 0.70 0.60 0.75 0.73  5.46
  Percent of Normal   26  171 67  32 36 233 52 350 220 428  187
Cody  None 0.42 1.54 1.29 0.10 0.87 0.20 1.66 5.10 0.92 0.52 12.62
  1981-2010 Normals 0.89 0.48 0.33 0.33 0.33 0.56 1.06 1.82 1.68 1.11 0.91 1.06  8.59
  Percent of Normal   47  321  391  30  264 36 157 280 55 47  147
Snowfall  0.0  19.0  14.0  2.0  7.0 1.5 4.0 0.0 0.0 0.0 47.5
1981-2010 Normals 4.3 6.3 8.0 7.8 6.7 6.9 6.3 0.8 0.0 0.0 0.0 0.2 47.1
  Percent of Normal  0  302  175  26  104 22 63 0 0 0  101
Dubois  None 0.40 1.00 0.69 0.15 0.46 0.35 0.55 3.28 1.31 1.62  9.81
  1981-2010 Normals 0.81 0.57 0.28 0.24 0.38 0.40 1.10 1.64 1.28 1.11 0.86 1.24  7.81
  Percent of Normal  49  175  246  63  121 88 50 200 102 146  126
Snowfall 1.0  13.5  16.5  2.0  10.6 5.5 4.5 T 0.0 0.0 53.6
1981-2010 Normals 3.0 5.8 5.1 3.9 5.7 6.0 8.5 3.9 0.6 0.0 0.0 2.6 42.5
  Percent of Normal  33  233  324  51  186 92 53 0 0 0 126
Fossil Butte
National Monument		   D0 0.52 0.55 0.78  0.23 0.51 0.68 0.61 4.90 0.81 0.70  10.29
1981-2010 Normals 1.11 0.86 0.74 0.49 0.68 0.82 0.98 1.41 1.03 0.85 0.93 1.10  8.97
  Percent of Normal  47  64  105 47  75 83 62 348 79 82  115
Snowfall T  7.8  10.7  2.2  4.3 6.0 5.7 3.0 0.0 0.0  39.7
Green River  None 0.36 0.38 1.07 T 0.30 0.92 1.52 4.67 1.44 1.10  11.76
  1981-2010 Normals 0.81 0.41 0.44  0.34  0.43 0.71  0.85 1.23 0.98 0.55  0.68  0.90  6.75
  Percent of Normal  44  93  243 0  70 130 179 380 147 200  174
Snowfall 0.0  T  9.8 T  2.0 7.0 6.5 T 0.0 0.0  25.3
1981-2010 Normals 0.5 3.8 6.5 4.6 7.3 5.0 3.9 0.6 0.0 0.0 0.0 0.0 32.2
Percent of Normal 0  0  151 0  27 140 167 0 0 0  79
Station Name:
COOPS		 Drought
Conditions		 Oct
2014		 Nov
2014		 Dec
2014		 Jan
2015		 Feb
2015		 Mar
2015		 Apr
2015		 May
2015		 Jun
2015		 Jul
2015		 Aug
2015		 Sep
2015		 Total for
Water Year
Jeffrey City  None 0.11 0.21 1.21 0.20 0.40 0.79 1.94 4.70 0.67 1.00  11.23
  1981-2010 Normals 0.91 0.59 0.42  0.31  0.41 0.86  1.27 1.85 1.15 0.89  0.60  0.80  8.66
  Percent of Normal  12  36  288 65  98 92 153 254 58 112  130
Snowfall 0.0  2.1  16.0 3.0  7.0 9.0 20.0 7.0 0.0 0.0 64.1
1981-2010 Normals 7.3 6.6 5.5 4.6 6.7 9.4 10.2 4.9 0.4 0.0 0.0 1.4  55.6
  Percent of Normal  0  32 291 65  104 96 196 143 0 0  115
Kaycee  None 0.51 0.56 0.77 0.32 0.87 0.02 1.16 6.00 1.03 0.74  11.98
  1981-2010 Normals 1.04 0.57 0.31 0.30 0.34 0.74 1.46 2.37 1.84 1.42 0.80 1.18  10.39
  Percent of Normal  49  98  248  107  256 3 79 253 56 52  115
Snowfall T  8.5  10.0  3.5  12.0 T T 3.0 0.0 0.0 37.0
1981-2010 Normals 1.5 4.2 6.0 5.9 6.3 8.0 4.7 0.6 0.1 0.0 0.0 0.2 37.3
  Percent of Normal  0  202  167  59  190 0 0 500 0 0 99
Moose   D0 0.54  3.55 3.26 2.31 1.57 0.67 0.80 3.83 1.03 2.72  20.28
  1981-2010 Normals 1.47 2.64 2.67 2.58 1.82 1.62 1.49 1.88 1.61 1.29 1.29 1.44  19.07
  Percent of Normal  37  134  122 90  86 41 54 204 64 211 106
Snowfall T  43.3  39.6  26.0  19.1 11.0 5.4 0.0 0.0 0.0  144.4
1981-2010 Normals 4.8 24.1 44.7 36.9 26.6 15.9 7.4 2.2 0.0 0.0 0.0 0.2  162.6
  Percent of Normal  0  180  89  70  72 69 73 0 0 0 89
Old Faithful  D0 1.73 2.49 2.46 1.23 0.75 0.77 0.94 3.75 1.24 2.14 17.50
  1981-2010 Normals 1.66 2.29 3.16  2.11 1.99 2.21 2.21 2.80 2.47 1.55 1.46 1.46  22.45
  Percent of Normal   104  109 78  58  38 35 43 134 50 138 78
Snowfall 2.0  20.0  36.3  30.0  6.0  1.0 3.5 T 0.0 0.0  98.8
1981-2010 Normals 7.7 31.7 43.8 37.5 31.1 26.8 19.3 7.3 1.2 0.0 0.0 1.4  206.4
  Percent of Normal  26  63  83  80  19 4 18 0 0 0 48
Powell Field Station   None 0.22 0.43 0.10 0.04 0.03 0.09 0.39 2.13 0.60 0.32  4.35
  1981-2010 Normals 0.56 0.18 0.13 0.21 0.13 0.29 0.51 1.40 1.35 0.87 0.52  0.65  5.63
  Percent of Normal  39 239 77  19  23 31 76 152 44 37 77
Snowfall 0.0  3.8  1.3  0.3  0.3 0.1 T 0.0 0.0 0.0 5.8
1981-2010 Normals  1.2 1.3 1.2 2.3 0.5 2.5 0.5 0.5 0.0 0.0 0.0 0.1 10.0
  Percent of Normal  0  292  108  13  60 4 0 0 0 0  58
Riverton (downtown)  None 0.18 0.41 0.55 0.04 1.28 0.47 1.10 4.03 0.82 0.81 9.69
  1981-2010 Normals 0.85 0.41 0.24 0.28 0.33 0.56 0.98 1.45 1.21 0.78 0.50 0.83  7.09
  Percent of Normal  21  100 229  14  388 84 112 278 68 104  137
Snowfall T  7.8  7.4  0.7  17.8 6.6 1.8 T 0.0 0.0 42.1
1981-2010 Normals 3.7 4.3 4.8  4.8  6.0  5.9  6.1 1.2 0.0 0.0 0.0 0.3 36.8
  Percent of Normal  0  181  154  15  297 112 30 0 0 0 114
Thermopolis   None 0.22 0.37 2.04 0.14 0.92 0.06 1.60 4.54 1.50 0.38 11.77
  1981-2010 Normals 1.26 0.80 0.46 0.35 0.45 0.87 1.46 1.86 1.51 0.88 0.58 1.23  9.90
  Percent of Normal   17  46  443  40  204 7 110 244 99 43  119
Snowfall 0.0  9.0  23.0  3.0  3.5 1.0 T 0.0 0.0 0.0  39.5
1981-2010 Normals 2.4 3.7 4.5 5.6  4.6 2.5 2.8 0.4 0.0 0.0 0.0 0.2 26.5
  Percent of Normal  0 243 511  54  76 40 0 0 0 0  149
Drought Classifications on July 28, 2015     |      XX.X / M – Data partially or completely missing
Wyoming Climate      |      Click on Image to Enlarge
Statewide averages and ranks for periods including July 2015 will be available on August 6, 2015* 
* 2015 Climate Monitoring Release Dates
Last Month
Precipitation – Percent of Normal Temperature – Departure from Normal
Wyoming: Last Month Percent of Normal Precipitation Wyoming: Last Month Departure from Normal Temperature
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 1.84  20th Century Average 57.6
 Rank – Driest  to Wettest  (121 Years)  Rank – Warmest  to Coldest (121 Years)
 Rank – Wettest to Driest (121 Years)  Rank – Coldest to Warmest (121 Years)
 Driest Month on Record: Jun 2012 0.45   Warmest Month on Record: Jun 1988 66.4
 Wettest Year on Record: Jun 1967 4.33   Coldest Month on Record: Jun 1951 51.5
Last 3 Months
Precipitation – Percent of Normal Temperature – Departure from Normal
Wyoming: Last Three Months Percent of Normal Precipitation Wyoming: Last 3 Months Departure from Normal Temperature
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 5.82  20th Century Average 48.3
 Rank – Driest  to Wettest  (121 Years)  Rank – Warmest  to Coldest (121 Years)
 Rank – Wettest to Driest (121 Years)  Rank – Coldest to Warmest (121 Years)
 Driest Period on Record: Apr – Jun 1919 2.91  Warmest Period on Record: Apr – Jun 1988 53.1
 Wettest Period on Record: Apr – Jun 1957 9.32  Coldest Period on Record: Apr – Jun 1917 43.7
2015
Precipitation – Percent of Normal Temperature – Departure from Normal
Wyoming: 2015 Percent of Normal Precipitation Wyoming: 2015 Departure from Normal Temperature
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 9.10  20th Century Average 35.8
 Rank – Driest  to Wettest  (121 Years)  Rank – Warmest  to Coldest (121 Years)
 Rank – Wettest to Driest (121 Years)  Rank – Coldest to Warmest (121 Years)
 Driest Period on Record: Jan – Jun 1919 4.72  Warmest Period on Record: Jan – Jun 1934 41.5
 Wettest Period on Record: Jan – Jun 1899, 1995 12.70  Coldest Period on Record: Jan – Jun 1917 30.3
2014-2015 Water Year
Precipitation – Percent of Normal Temperature – Departure from Normal
Wyoming: 2014-2015 Water Year Percent of Normal Precipitation Wyoming: 2014-2015 Water Year Departure from Normal Temperature
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 12.34  20th Century Average 34.1
 Rank – Driest  to Wettest  (120 Years)  Rank – Warmest  to Coldest (120 Years)
 Rank – Wettest to Driest (120 Years)  Rank – Coldest to Warmest (120 Years)
 Driest Periods on Record: Oct 1918 – Jun 1919 7.12  Warmest Period on Record: Oct 1933 – Jun 1934  39.7
 Wettest Period on Record: Oct 1994 – Jun 1995  17.66  Coldest Period on Record: Oct 1916 – Jun 1917 28.6
Last 12 Months
Precipitation – Percent of Normal Temperature – Departure from Normal
Wyoming: Last 12 Months Percent of Normal Precipitation Wyoming: Last 12 Months Departure from Normal Temperature
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 15.94  20th Century Average 40.8
 Rank – Driest  to Wettest  (120 Years)  Rank – Warmest  to Coldest (120 Years)
 Rank – Wettest to Driest (120 Years)  Rank – Coldest to Warmest (120 Years)
 Driest Period on Record: Jun 1933 – May 1934 11.11  Warmest Period on Record: Jul 1933 – Jun 1934  45.3
 Wettest Period on Record: Jul 1994 – Jun 1995 20.33  Coldest Period on Record: Jul 1916 – Jun 1917 36.4
Last 5 Years (Aug 2010 – Jul 2015)
Precipitation – Percent of Normal Temperature – Departure from Normal
Map Not Available For This Period Map Not Available For This Period
 Statewide Average (inches)  Statewide Average (°F)
 20th Century Average 79.51  20th Century Average 40.7
 Rank – Driest  to Wettest  (120 Years)  Rank – Warmest  to Coldest (120 Years)
 Rank – Wettest to Driest (120 Years)  Rank – Coldest to Warmest (120 Years)
 Driest Period on Record: Jul 1999 – Jul 2004 65.21  Warmest Period on Record: Jul 2002 – Jun 2007 42.8
 Wettest Period on Record: Jul 1