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Wyoming Climate      |      Click on Image to Enlarge
Statewide averages and ranks for periods including September 2018 will be available on October 9, 2018*
* 2018 Climate Monitoring Release Dates

Wyoming: August 2018

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) 1.02  Statewide Average (°F) 63.6
 20th Century Average 1.07  20th Century Average 63.4
 Rank - Driest  to Wettest  (124 Years) 68 Rank - Warmest  to Coldest (124 Years) 63
 Rank - Wettest to Driest  (124 Years) 57  Rank - Coldest to Warmest (124 Years) 62
 Driest Month on Record:  August 1944 0.23   Warmest Month on Record: August 2003 68.1
 Wettest Year on Record: August 1930 3.19   Coldest Month on Record: August 1927 59.4

Wyoming: Water Year 2017-18 (October 1 - September 30)

Precipitation - Percent of Normal Temperature - Departure from Normal
Wyoming: Water Year 2017-18 Percent of Normal Precipitation (Click to Enlarge) Wyoming: Water Year 2017-18 Departure from Normal Temperature
Climate Division:
Wyoming (Statewide Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   41.1 34.7 23.9 25.3 19.2 32.5 39.8 52.9 60.4 67.5 63.6     41.9
  20th Century Average   42.5 29.0 20.6 18.4 22.3 29.1 38.8 48.4 57.6 65.3 63.4 53.6   39.6
  Departure from Average   -1.4 5.7 3.3 6.9 -3.1 3.4 1.0 4.5 2.8 2.2 0.2     2.3
  Rank: Warm to Cold (124 yrs)    89 8 27 8 98 29 51 7 27 26 63     12
  Rank: Cold to Warm (124 yrs)    35 116 97 117 27 96 74 118 98 99 62     112
  Precipitation    0.78 1.48 1.01 0.90 1.23 1.35 1.46 3.03 2.10 1.16 1.02     15.52
  20th Century Average   1.20 1.03 1.01 1.06 0.97 1.25 1.77 2.21 1.84 1.28 1.07 1.24   14.69
  Percent of Average    65 144 100 85 127 108 82 134 114 91 95     106
  Rank: Dry to Wet (124 yrs)   33 106 66 47 102 78 48 22 84 69 68     75
  Rank: Wet to Dry (124 yrs)   92 19 59 78 23 47 77 103 41 56 57     49
    
Maps and Statewide Averages for 3, 12 and 60 Months

Wyoming Climate Divisions: Water Year 2017-18 (Oct - Sep)

Wyoming Climate Divisions Map - Click to Enlarge

Climate Division 1 - Yellowstone Drainage
Climate Division:
Yellowstone (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   36.3 28.1 19.8 22.7 16.3 27.1 34.7 47.5 51.5 60.2 56.6     36.4
  20th Century Average   37.3 24.6 16.9 15.2 18.9 24.3 33.3 42.4 50.3 57.9 56.2 47.4   34.3
  Departure from Avegage   -1.0 3.5 2.9 7.5 -2.6 2.8 1.4 5.1 1.2 2.3 0.4     2.1
  Rank: Warm to Cold (124 yrs)    84 24 30 6 96 38 45 6 41 19 58     11
  Rank: Cold to Warm (124 yrs)    40 100 94 119 29 87 80 119 84 106 67     113
  Precipitation    1.37 5.51 2.86 2.92 3.91 2.52 4.06 3.14 4.00 0.58 1.62     32.49
  20th Century Average   1.88 2.49 2.63 2.89 2.26 2.61 2.47 2.84 2.57 1.61 1.51 1.80    25.76
  Percent of Average    73 221 109 101 173 97 164 111 156 36 107     126
  Rank: Dry to Wet (124 yrs)   40 119 73 71 117 59 119 82 110 10 83     115
  Rank: Wet to Dry (124 yrs)   84 5 51 54 8 66 6 43 15 115 42     9
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Old Faithful None   1.62 5.47 2.10 2.44 3.53 2.58 2.54 1.93 3.99 0.58 1.39     28.17
  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    23.91
  Percent of Normal     98 239 66 116 177 117 115 69 162 37 95     118
Snowfall    8.5 45.5 43.5 40.5 57.5 27.5 12.0 0.0 0.0 0.0 0.0     235.0
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     110 144 99 108 185 103 62 0 0 0 0     114
                               

Climate Division 2 - Snake Drainage
Climate Division:
Snake (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   35.2 27.8 19.5 22.1 18.7 25.4 34.7 46.3 51.2 59.8 56.5     36.1
  20th Century Average   37.4 24.3 16.0 14.7 18.3 23.6 33.0 42.3 50.0 57.7 56.0 47.5   33.9
  Departure from Avegage   -2.2 3.5 3.5 7.4 0.4 1.8 1.7 4.0 1.2 2.1 0.5     2.2
  Rank: Warm to Cold (124 yrs)    96 24 23 3 59 47 40 7 41 20 53     8
  Rank: Cold to Warm (124 yrs)    28 100 101 122 66 78 85 118 84 105 72     116
  Precipitation    1.63 6.35 2.48 3.73 3.71 4.27 4.74 3.89 2.75 0.60 1.46     35.61
  20th Century Average   2.12 3.33 3.72 4.34 3.59 3.45 2.81 2.91 2.31 1.32 1.46 1.77    31.36
  Percent of Average   77 191 67 86 103 123 169 134 119 45 100     114
  Rank: Dry to Wet (124 yrs)   46 115 31 55 79 33 121 103 87 16 74     91
  Rank: Wet to Dry (124 yrs)   78 9 93 70 46 92 4 22 38 109 51     33
   

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Afton D0   0.64 2.83 1.42 1.42 1.29 2.29 2.29 2.61 1.57 0.68 0.61     17.66
  1981-2010 Normals   1.63 1.48 1.25 1.40 1.09 1.40 1.54 2.26 1.97 1.43 1.25 1.46   16.70
  Percent of Normal    39 191 114 101 118 164 149 115 80 48 49     106
Snowfall    2.4 5.7 19.6 16.2 11.8 23.1 7.2 T 0.0 0.0 0.0     86.0
                               
Moose D0   1.00 3.85 1.34 1.62 2.15 2.89 3.03 2.74 2.66 0.55 1.40     23.23
  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    20.36
  Percent of Normal    68 146 50 63 117 178 203 146 165 43 109     114
Snowfall    4.1  13.6 15.9 23.4 19.4 22.1 14.2 T 0.0 0.0 0.0      112.7
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     85 56 36 63 73 139 192 0 0 0 0     69
                               
JHMR MId Mtn D0                              
Snowfall    22.0 70.0 52.0 65.0 63.0 66.0 63.0 7.0 0.0 0.0 0.0       408.0
1975-2018 Average   17.0 34.0 76.0 82.0 65.0 56.0 21.0 13.0 2.0 0.0 0.0 1.0    366.0
  Percent of Normal     129 206 68  79 97 118 300 54 0 0 0     111
                               

Climate Division 3 - Green and Bear Drainages
Climate Division:
Green and Bear (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   39.1 33.7 24.7 24.9 21.5 31.2 39.4 51.1 58.8 66.2 62.0     41.1
  20th Century Average   40.7 27.0 18.3 16.2 19.7 27.0 37.0 46.6 55.3 62.8 60.8 51.6   37.4
  Departure from Avegage   -1.6 6.7 6.4 8.7 1.8 4.2 2.4 4.5 3.5 3.4 1.2     3.7
  Rank: Warm to Cold (124 yrs)    92 4 9 5 50 26 34 6 18 10 37     5
  Rank: Cold to Warm (124 yrs)    32 120 115 120 75 99 91 119 107 115 88     119
  Precipitation    0.35 1.37 0.86 0.78 1.02 1.10 1.02 2.03 0.94 0.50 0.67     10.64
  20th Century Average   1.16 1.03 1.03 1.15 1.06 1.17 1.37 1.55 1.14 0.94 1.00 1.10    12.60
  Percent of Average    30 133 83 68 96 94 74 131 82 53 67     84
  Rank: Dry to Wet (124 yrs)   13 93 49 41 71 66 39 98 66 20 42     34
  Rank: Wet to Dry (124 yrs)   111 31 75 84 54 59 86 27 59 105 83     90
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Big Piney Airport  D0   0.01 0.25 0.07 0.05 T 0.27 0.37 1.84 1.66 0.22 0.49     5.23
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    5.70
Percent of Normal    2 119 23 16 0 61 70 219 210 31 71     92
                               
Evanston Airport D1   T 1.47 0.07 0.17 0.41 0.06 T 0.33 1.04 0.52 0.83     4.90
  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   10.82
  Percent of Normal     0 141 12 31 67 7 0 19 84 58 86     45
                               
Rock Springs Arpt.  D1   0.02 0.29  0.11 0.08 0.11 0.34 0.16 1.59 0.16 0.16 0.25     3.27
 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    7.64
  Percent of Normal     2 59  22 18 23 50 18 131 20 25 40      43
                               
Bitter Creek 4NE D1   0.04 0.50 0.32 0.10 0.26 0.43 0.50 1.98 0.18 0.13 0.47     4.91
  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    6.21
  Percent of Normal     6 161  63 36 72 143 77 182 26 22 63     79
                               
Fossil Butte N.M.   D0    0.50 1.89  0.86 0.60 0.88 0.92 1.48 1.66 0.56 0.48 0.11     9.94
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    9.90
  Percent of Normal    45 220  116 122 129 112 151 118 54 56 12     100
Snowfall    1.7 8.5  12.5 7.3 11.9 7.0 4.6 T 0.0 0.0 0.0      53.5
                               
Green River D1   0.07 0,80  0.60 0.68 0.53 1.12 1.15 2.54 0.45 0.25 0.36     8.55
  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    7.43
  Percent of Normal   9 195  136 200 123 158 135 207 46 45 53     115
Snowfall   T 4.5  6.3 6.8 6.9 6.7 0.8 0.0 0.0 0.0 0.0      32.0
1981-2010 Normals   0.5 3.8 6.5 64.6 7.3 5.0 3.9 0.6 0.0 0.0 0.0 0.0   32.2
Percent of Normal   0 118 97 148 95 134 21 0 0 0 0      99
                               
Rock Springs  D1   0.10 0.65  0.49 0.37 0.55 0.12 0.50 2.71 0.19 T 0.37     6.05
  1981-2010 Normals   1.09 0.52 0.52  0.44  0.46 0.67  0.91 1.42 0.86 0.73  0.96  1.08   8.58
  Percent of Normal    9 125  94 84 120 18 55 191 22 0 39     71
Snowfall   T 1.1 6.9 5.5 7.3 0.0 T 0.0 0.0 0.0 0.0      20.8
                               

Climate Division 4 - Big Horn Drainage
Climate Division:
Big Horn (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   41.6 33.4 23.0 25.0 16.8 33.3 40.2 53.7 60.2 68.2 63,9     41.8
  20th Century Average   42.6 29.2 20.6 17.7 22.7 30.2 39.8 49.1 58.1 65.8 63.7 53.5   40.0
  Departure from Avegage   --1.0 4.2 2.4 7.3 -5.9 3.1 0.4 4.6 2.1 2.4 0.2     1.8
  Rank: Warm to Cold (124 yrs)    81 22 45 12 109 33 59 6 34 25 66     20
  Rank: Cold to Warm (124 yrs)    43 102 79 113 16 92 66 119 91 100 59     104
  Precipitation   0.79 1.46 1.16 0.63 1.42 1.02 1.75 3.49 2.18 0.59 1.06     15.55
  20th Century Average   1.14 0.95 0.87 0.92 0.75 1.12 1.75 2.22 1.92 1.13 0.94 1.31   13.71
  Percent of Average   69 154 133 68 189 91 100 157 114 52 113     113
  Rank: Dry to Wet (124 yrs)   41 105 92 37 117 59 74 110 86 26 89     95
  Rank: Wet to Dry (124 yrs)   83 19 32 88 8 66 51 15 39 99 36     29
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Greybull Airport   None   T 0.21 0.22 0.01 0.26 0.33 0.87 1.94 1.20 0.16 0.74     5.94
  1981-2010 Normals    0.30  0.28  0.60  0.23  0.18  0.40  0.71  1.65  1.20  0.66  0.42  0.88    6.63
  Percent of Normal     0 70 79 4 144 83 151 118 100 24 176     90
                               
Worland Airport None   0.23 0.68 0.44 0.15 0.17 0.66 1.30 2.00 0.81 0.23 0.54     7.21
  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    6.72
  Percent of Normal     33 194 191 65 89 143 151 141 70 32 126     107
                               
Cody  None   0.59 1.04 0.84 0.37 0.51 0.27 1.35 4.06 2.21 0.58 1.35     13.17
  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    9.50
  Percent of Normal     66 217 255 112 155 48 127 223 132 52 148     139
Snowfall    1.0 6.6 9.0 2.0 8.0 1.3 6.6 0.0 0.0 0.0 0.0     34.5
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     23 105 113 26 119 19 105 0 0 0 0     73
                               
Powell Field Station   None   0.01 0.25 0.19 0.08 0.31 0.10 0.74 2.13 1.97 0.11 0.95     6.84
  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    6.15
  Percent of Normal     2 139 146 38 238 34 145 152 146 13 183     111
Snowfall    0.0 0.8 2.0 3.0 5.5 T 3.2 0.0 0.0 0.0 0.0     14.5
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  62 167 130 1100 0 640 0 0 0 0      145
                               
Thermopolis   None   0.70 0.65 0.70 0.39 0.27 0.64 1.16 3.19 2.11 0.50 0.42     10.73
  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   10.48
  Percent of Normal     56 81 152 111 60 74 79 172 140 57 72     102
Snowfall   0.0 8.0 11.6 4.5 6.0 1.0 0.0 0.0 0.0 0.0 0.0      31.1
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     0 216 258 80 130 40 0 0 0 0 0     117

Climate Division 5 - Powder and Tongue Drainages
Climate Division:
Powder and Tongue
(Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   43.3 35.3 23.4 25.7 16.4 33.3 40.8 55.6 62.4 70.0 66.1     40.5
  20th Century Average   44.6 31.0 22.3 19.6 23.8 31.1 41.2 50.8 60.2 68.2 66.5 55.9   39.3
  Departure from Avegage   -1.3 4.3 1.1 6.1 -7.4 2.2 -0.4 4.8 2.2 1.8 -0.4     1.2
  Rank: Warm to Cold (124 yrs)   83 26 68 23 110 43 68 9 34 39 73     39
  Rank: Cold to Warm (124 yrs)   41 98 56 102 15 82 57 116 91 86 52     85
  Precipitation   0.79 0.84 0.72 0.56 1.07 1.39 1.21 2.82 2.70 1.51 1.31     14.92
  20th Century Average   1.16 0.77 0.65 0.63 0.61 1.05 1.85 2.54 2.35 1.40 0.99 1.28   14.00
  Percent of Average    68 109 111 89 175 132 65 111 115 108 132     107
  Rank: Dry to Wet (124 yrs)   41 81 83 61 116 93 35 78 86 83 95     78
  Rank: Wet to Dry (124 yrs)   84 43 41 64 9 32 90 47 39 42 30     46
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Buffalo Airport None    0.27  0.61 0.32 0.12 0.22  0.93  0.73 3.04 1.66 1.80 0.94     10.64
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   12.14
  Percent of Normal     29  113 80 29 63  101  56 120 73 108 116      88
                               
Sheridan Arpt None   0.34 1.54 1.11 0.63 1.53  1.50  1.83 3.57 1.43 1.21 1.30     15.99
  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   12.73
  Percent of Normal     24 217 198 113 283  153  114 152 67 103 181      126
                               
Kaycee None   1.34 0.76 0.38 0.34 0.64  0.72 0.42 2.05 2.78 0.38 1.26     11.07
  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    11.19
  Percent of Normal     129 133 123 113 188  97 29 86 151 27 158     99
Snowfall    1.0 7.5 9.3 5.5 14.0  5.0 4.0 0.0 0.0 0.0 0.0     46.3
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     67  179 155 93 222  63 85 0 0 0 0     124
                               

Climate Division 6 - Belle Fourche Drainage
Climate Division:
Belle Fourche (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   44.0 35.2 21.9 23.4 13.4 32.1 39.2 56.4 63.1 69.8 66.2     42.2
  20th Century Average   45.0 31.0 22.1 19.0 23.1 30.6 41.4 51.3 60.9 68.8 67.0 56.4   41.8
  Departure from Avegage   -1.0 4.2 -0.2 4.4 -9.7 1.5 -2.2 5.1 2.2 1.0 -0.8     0.4
  Rank: Warm to Cold (124 yrs)   80 25 74 36 116 52 94 9 35 48 79     55
  Rank: Cold to Warm (124 yrs)   44 99 50 89 9 73 31 116 90 77 46     69
  Precipitation   0.88 0.61 0.92 0.63 1.34 1.74 1.54 3.35 4.15 2.46 1.88     19.50
  20th Century Average   1.14 0.69 0.64 0.59 0.59 0.98 1.75 2.66 2.83 1.84 1.33 1.32    15.04
  Percent of Average    77 88 144 107 227 178 88 126 147 134 141     130
  Rank: Dry to Wet (124 yrs)   55 63 96 89 122 114 59 89 109 101 98     112
  Rank: Wet to Dry (124 yrs)   69 61 28 46 3 11 66 36 16 24 27     12
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Gillette Airport None   1.12 0.49 0.71 0.69 1.10 1.86 1.02 1.94 4.77 1.50 2.18     17.40
1981-2010 Normals    1.27  0.55  0.40  0.39 0.39  0.96  1.47  2.45 2.21  1.66  0.95  1.19    12.70
  Percent of Normal     88 89 178 177 282 194 69 79 216 90 229     137
                               

Climate Division 7 - Cheyenne and Niobrara Drainages
Climate Division: Cheyenne and Niobrara
(Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   44.6 36.5 22.6 23.0 16.4 35.0 41.0 56.8 64.7 70.5 67.1     43.5
  20th Century Average   45.8 31.8 23.0 20.3 24.6 32.1 42.5 52.4 62.5 70.3 68.4 57.6   43.1
  Departure from Avegage   -1.2 4.7 -0.4 2.7 -8.2 2.9 -1.5 4.4 2.2 0.2 -1.3     0.4
  Rank: Warm to Cold (124 yrs)   84 20 75 51 113 37 85 8 34 65 88     51
  Rank: Cold to Warm (124 yrs)   40 104 49 74 12 88 40 117 91 60 37     73
  Precipitation   0.78 0.56 0.57 0.68 0.80 1.20 1.01 4.54 3.57 2.84 1.08     17.65
  20th Century Average   0.95 0.55 0.48 0.42 0.46 0.76 1.68 2.53 2.34 1.78 1.21 1.14   13.16
  Percent of Average    82 102 119 162 174 158 60 179 153 160 89     134
  Rank: Dry to Wet (124 yrs)   53 74 91 105 109 103 30 113 113 108 56     118
  Rank: Wet to Dry (124 yrs)   71 50 33 20 16 22 95 12 12 17 69     6
    

Climate Division 8 - Lower Platte Drainage
Climate Division:
Lower Platte (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   44.0 39.4 27.0 28.7 23.1 36.4 42.0 55.2 64.1 69.3 65.8     45.0
  20th Century Average   45.2 32.3 24.7 22.8 25.9 32.1 41.2 50.8 60.7 68.0 66.2 56.4   42.7
  Departure from Avegage   -1.2 7.1 2.3 5.9 -2.8 4.3 0.8 4.4 3.4 1.3 -0.4     2.3
  Rank: Warm to Cold (124 yrs)   88 4 36 13 89 25 57 6 21 43 70     12
  Rank: Cold to Warm (124 yrs)    36 120 88 112 36 100 68 119 104 82 55     112
  Precipitation   0.85 0.53 0.58 0.52 0.46 1.08 1.02 3.99 1.88 1.88 1.15     13.94
  20th Century Average   1.05 0.68 0.63 0.51 0.59 0.97 1.90 2.55 2.05 1.58 1.17 1.21   13.68
  Percent of Average   81 78 92 102 78 111 54 156 92 119 98     102
  Rank: Dry to Wet (124 yrs)   49 48 64 70 41 79 25 108 65 89 68     65
  Rank: Wet to Dry (124 yrs)   75 76 60 55 84 46 100 17 60 36 57     59
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Casper Airport   None   1.08 0.31 1.37 0.68 0.62 1.00 1.03 2.86 1.63 1.62 0.33     13.94
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    13.68
  Percent of Normal     97 41 280 133 109 122 80 142 101 115 39      102
Snowfall   5.6  3.6 19.4 12.3 18.6 6.5 5.7 T 0.0 0.0 0.0     71.7
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     76 35 176 135 190 60 49 0 0 0 0      98
                               
Cheyenne Arpt None   1.13 0.44 0.57 0.57 0.34 1.01 0.94 4.10 1.55 2.43 2.71     15.79
  1981-2010 Normals    0.93  0.59  0.49  0.33  0.47  1.05  1.78  2.34  2.34  2.19 1.95  1.48   14.46
  Percent of Normal     122 75 114 173 72 96 53 175 66 111 139      109
Snowfall    8.0 4.2 13.0 7.4 5.3 6.6 7.1 T T T T     51.6
1981-2010 Normals   5.0  8.0 8.4 5.9 7.9 11.3 10.2 2.3 0.0 0.0 0.0 1.3   59.0
  Percent of Normal     160 53 106 125 67 58 70 0 0 0 0     87
                               

Climate Division 9 - Wind River Drainage
Climate Division:
Wind River (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   40.3 33.6 23.4 25.1 18.9 32.3 39.5 51.8 59.0 67.1 63.4     41.3
  20th Century Average   41.8 27.9 19.5 17.3 22.0 29.0 38.3 48.0 57.0 64.7 62.8 52.9   38.9
  Departure from Avegage   -1.5 5.7 3.9 7.4 -3.1 3.3 1.2 3.8 2.0 2.4 0.6     2.4
  Rank: Warm to Cold (124 yrs)    87 12 26 8 92 32 47 12 37 24 52     12
  Rank: Cold to Warm (124 yrs)   37 112 98 117 33 93 78 113 88 101 73     112
  Precipitation   0.92 1.65 1.37 0.68 1.20 1.14 1.29 3.69 2.10 0.79 0.50     15.33
  20th Century Average   1.20 0.96 0.84 0.93 0.81 1.26 1.89 2.25 1.67 1.04 0.88 1.19   13.73
  Percent of Average    77 172 163 73 148 90 68 164 126 76 57     112
  Rank: Dry to Wet (124 yrs)   49 110 106 43 108 60 43 108 90 57 37     94
  Rank: Wet to Dry (124 yrs)   75 14 18 82 17 65 82 17 35 68 88     30
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Lander Airport None   1.07 0.45 1.23 0.68 0.94 1.09 1.49 4.07 1.66 0.67 0.21     13.56
  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   11.61
  Percent of Normal     83 52 212 166 162 94 80 185 131 86 34      117
Snowfall    4.5 3.5 18.4 11.5 9.3 8.1 2.7 T 0.0 0.0 0.0     58.0
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     46 27 182 151 90 50 16 0 0 0 0     65
                               
Riverton Airport  None   0.61 0.54 0.64 0.38 0.78 0.73 1.26 2.85 1.14 0.53 0.15     9.61
  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   8.53
  Percent of Normal     69 108 200 158 289 133 97 166 89 60 26     113
Snowfall    2.7 4.6 11.6 5.7 12.0 7.5 4.2 T T 0 0     48.3
                               
Dubois  None   0.95 1.70 0.74 0.22 0.52 0.56 1.26 3.20 2.88 0.65 0.74     13.42
  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    8.67
  Percent of Normal     117 298 264 92 137 140 115 195 225 59 86       155
Snowfall    13.0 17.1 10.7 3.2 7.6 5.6 8.5 2.0 0.0 0.0 0.0     67.7
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     433 295 210 82 133 93 100 51 0 0 0     159
                               
Riverton  None   0.53 0.44 0.66 0.44 0.70 0.79 0.48 3.63 0.65 0.41 0.19     8.92
  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    7.59
  Percent of Normal     62 107 275 157 212 141 49 250 54 53 38       118
Snowfall    1.3 3.6 11.2 5.9 10.5 9.7 1.8 T T 0.0 T     44.0
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     35 84 233 123 175 164 30 0 0 0 0     120

Climate Division 10 - Upper Platte Drainage
Climate Division:
Upper Platte (Division Averages)
  Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
  Average Temperature   40.4 36.2 25.0 26.2 21.2 32.3 39.8 52.0 60.7 67.2 63.3     42.2
  20th Century Average   41.8 28.3 20.2 18.3 21.7 28.0 37.5 47.4 57.1 64.5 62.6 52.9   38.9
  Departure from Avegage   -1.4 7.9 4.8 7.9 -0.5 4.3 2.3 4.6 3.6 2.7 0.7     3.4
  Rank: Warm to Cold (124 yrs)   86 5 13 6 71 25 36 5 18 20 49     6
  Rank: Cold to Warm (124 yrs)   38 119 111 119 54 100 89 120 107 105 76     118
  Precipitation   0.68 0.83 0.76 0.67 0.78 0.90 0.86 1.73 1.20 0.83 0.82     10.06
  20th Century Average   1,09 0.83 0.82 0.80 0.83 1.06 1.58 1.78 1.27 1.10 0.93 1.08   12.11
  Percent of Average    62 100 93 84 94 86 54 97 94 75 86     83
  Rank: Dry to Wet (124 yrs)   36 63 57 45 60 50 19 67 64 39 59     24
  Rank: Wet to Dry (124 yrs)   88 61 67 80 65 75 106 58 61 86 66     100
    

Station Name:   Oct
2017
Nov
2017
Dec
2017
Jan
2018
Feb
2018
Mar
2018
Apr
2018
May
2018
Jun
2018
Jul
2018
Aug
2018
Sep
2018
  Total for
WY 2017-18
 click on location   D0 D1                              
 for graph D2 D3 D4                              
Jeffrey City  None   0.22 0.26 0.62 0.57 0.45 0.54 0.40 2.12 1.54 0.94 0.34     8.00
  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    9.26
  Percent of Normal    24 44 148 184 110 63 31 115 134 106 57     86
Snowfall   4.0 1.0 8.0 8.5 4.0 5.0 3.0 0.0 0.0 0.0 0.0     33.5
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    55 15 145 185 60 53 29 0 0 0 0      60

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Previous Annual and Water Year Climate Summaries
Wyoming Climate      |      Click on Image to Enlarge
Statewide averages and ranks for periods including September 2018 will be available on October 9, 2018*
* 2018 Climate Monitoring Release Dates

Wyoming: 2018

Precipitation - Percent of Normal Temperature - Departure from Normal
Wyoming: 2018 Percent of Normal Precipitation Wyoming: 2018 Departure from Normal Temperature
 Statewide Average (inches) 12.25  Statewide Average (°F) 45.2
 20th Century Average 11.46  20th Century Average 43.0
 Rank - Driest  to Wettest  (123 Years) 80  Rank - Warmest  to Coldest (123 Years) 15
 Rank - Wettest to Driest (123 Years) 45  Rank - Coldest to Warmest (123 Years) 110
 Driest Period on Record: Jan -  Aug 1919 6.06  Warmest Period on Record:  Jan - Aug 1934, 2012 47.7
 Wettest Period on Record: Jan - Aug 1899 14.75  Coldest Period on Record: Jan - Aug  1917 38.6

 

Wyoming: Last 12 Months

Precipitation - Percent of Normal Temperature - Departure from Normal
Wyoming: Current Year Percent of Normal Precipitation Wyoming: Current Year Departure from Normal Temperature
 Statewide Average (inches) 17.73  Statewide Average (°F) 42.9
 20th Century Average 15.93  20th Century Average 40.7
 Rank - Driest  to Wettest  (123 Years) 93  Rank - Warmest  to Coldest (123 Years) 12
 Rank - Wettest to Driest (123 Years) 31  Rank - Coldest to Warmest (123 Years) 112
 Driest Period on Record: Sep 1933 - Aug 1934 10.54  Warmest Period on Record:  Sep 1933 - Aug 1934 45.5

 Wettest Period on Record: Sep 1994 - Aug 1995

20.40  Coldest Period on Record: Sep 1916 - Aug 1917 36.4

Last 5 Years (September 2013 - August 2018)

Precipitation - Percent of Normal Temperature - Departure from Normal
Map Not Available For This Period Map Not Available For This Period
 Statewide Average (inches) 90.10  Statewide Average (°F) 43.1
 20th Century Average 79.53  20th Century Average  40.7
 Rank - Driest  to Wettest  (119 Periods) 116  Rank - Warmest  to Coldest (119 Periods) 2
 Rank - Wettest to Driest  (119 Periods) 4  Rank - Coldest to Warmest (119 Periods) 118
 Driest Period on Record: Sep 1999 - Aug 2004 66.14  Warmest Period on Record: Sep 2011 - Aug 2016 43.3
 Wettest Period on Record: Sep 1994 - Aug 1999 93.52  Coldest Period on Record: Sep 1912 - Aug 1917 39.1