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

Wyoming: May 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) 2.93  Statewide Average (°F) 52.6
 20th Century Average 2.21  20th Century Average 48.4
 Rank - Driest  to Wettest  (124 Years) 101 Rank - Warmest  to Coldest (124 Years) 9
 Rank - Wettest to Driest  (124 Years) 24  Rank - Coldest to Warmest (124 Years) 116
 Driest Month on Record:  May 1936 0.46   Warmest Month on Record: Mayl 1934 57.1
 Wettest Year on Record: May 1908 5.09   Coldest Month on Record: May 1917 48.4

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 23.8 25.1 19.1 32.3 39.6 52.5           33.5
  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   31.1
  Departure from Average   -1.4 5.7 3.2 6.7 -3.2 3.2 0.8 4.1           2.4
  Rank: Warm to Cold (124 yrs)    90 9 29 9 98 34 52 9           14
  Rank: Cold to Warm (124 yrs)    35 116 96 116 27 91 73 116           110
  Precipitation    0.78 1.48 1.01 0.90 1.23 1.35 1.46 2.93           11.14
  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   10.50
  Percent of Average    65 144 100 85 127 108 82 133           106
  Rank: Dry to Wet (124 yrs)   33 106 66 47 102 78 48 24           76
  Rank: Wet to Dry (124 yrs)   92 19 59 78 23 47 77 101           48
    
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   36.2 27.9 19.7 22.6 16.2 27.1 34.6 47.4           29.0
  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   26.6
  Departure from Avegage   -1.1 3.3 2.8 7.4 -2.7 2.8 1.3 5.0           2.4
  Rank: Warm to Cold (124 yrs)    85 25 33 6 97 38 46 6           13
  Rank: Cold to Warm (124 yrs)    40 100 92 119 28 87 79 119           111
  Precipitation    1.37 5.51 2.86 2.92 3.91 2.52 4.06 2.94           26.09
  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    20.07
  Percent of Average    73 221 109 101 173 97 164 104           130
  Rank: Dry to Wet (124 yrs)   40 119 73 71 117 59 119 73           114
  Rank: Wet to Dry (124 yrs)   85 6 52 54 8 66 6 52           10
    

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           22.21
  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    18.43
  Percent of Normal     98 239 66 116 177 117 115 69           121
Snowfall    8.5 45.5 43.5 40.5 57.5 27.5 12.0 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    205.2
  Percent of Normal     110 144 99 108 185 103 62 0           115
                               

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   35.0 27.7 19.4 21.9 18.7 25.4 34.5 46.0           28.6
  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   26.2
  Departure from Avegage   -2.4 3.4 3.4 7.2 0.4 1.8 1.5 3.7           2.4
  Rank: Warm to Cold (124 yrs)    100 24 24 3 59 47 43 8           10
  Rank: Cold to Warm (124 yrs)    25 101 101 122 66 78 82 117           114
  Precipitation    1.63 6.35 2.48 3.73 3.71 4.27 4.74 3.89           30.80
  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    26.27
  Percent of Average   77 191 67 86 103 123 169 134           117
  Rank: Dry to Wet (124 yrs)   46 115 31 55 79 33 121 103           99
  Rank: Wet to Dry (124 yrs)   79 10 94 70 46 92 4 22           25
   

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 None   0.64 2.83 1.42 1.42 1.29 2.29 2.29 2.61           14.80
  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   12.05
  Percent of Normal    39 191 114 101 118 164 149 115           123
Snowfall    2.4 5.7 19.6 16.2 11.8 23.1 7.2 T           86.0
                               
Moose None   1.00 3.85 1.34 1.62 2.15 2.89 3.03 2.74           18.62
  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    16.17
  Percent of Normal    68 146 50 63 117 178 203 146           115
Snowfall    4.1  13.6 15.9 23.4 19.4 22.1 14.2 T            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           69
                               
JHMR MId Mtn None                              
Snowfall    22.0 70.0 52.0 65.0 63.0 66.0 63.0 7.0             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    364.0
  Percent of Normal     129 206 68  79 97 118 300 54           112
                               

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   39.0 33.7 24.9 24.7 21.5 30.7 39.3 50.5           33.0
  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   29.1
  Departure from Avegage   -1.7 6.6 6.6 8.5 1.8 3.7 2.3 3.9           4.0
  Rank: Warm to Cold (124 yrs)    95 5 9 5 50 28 34 9           5
  Rank: Cold to Warm (124 yrs)    30 120 116 120 75 97 91 116           119
  Precipitation    0.35 1.37 0.86 0.78 1.02 1.10 1.02 2.03           8.53
  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    9.52
  Percent of Average    30 133 83 68 96 94 74 131           90
  Rank: Dry to Wet (124 yrs)   13 93 49 41 71 66 39 98           41
  Rank: Wet to Dry (124 yrs)   112 32 76 84 54 59 86 27           83
    

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  None   0.01 0.25 0.07 0.05 T 0.27 0.37 1.84           2.86
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    3.51
Percent of Normal    2 119 23 16 0 61 70 2.19           82
                               
Evanston Airport None   T 1.47 0.07 0.17 0.41 0.06 T 0.33           2.51
  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   7.72
  Percent of Normal     0 141 12 31 67 7 0 19           33
                               
Rock Springs Arpt.  D0   0.02 0.29  0.11 0.08 0.11 0.34 0.16 1.59           2.70
 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    5.59
  Percent of Normal     2 59  22 18 23 50 18 131            48
                               
Bitter Creek 4NE D0   0.04 0.50 0.32 0.10 0.26 0.43 0.50 1.98           4.13
  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    4.16
  Percent of Normal     6 161  63 36 72 143 77 182           99
                               
Fossil Butte N.M.   D0    0.50 1.89  0.86 0.60 0.88 0.92 1.48 1.66           8.79
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    7.09
  Percent of Normal    45 220  116 122 129 112 151 118           124
Snowfall    1.7 8.5  12.5 7.3 11.9 7.0 4.6 T            53.5
                               
Green River None   0.07 0,80  0.60 0.68 0.53 1.12 1.15 2.54           7.49
  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    5.22
  Percent of Normal   9 195  136 200 123 158 135 207          

143

Snowfall   T 4.5  6.3 6.8 6.9 6.7 0.8 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            99
                               
Rock Springs  None   0.10 0.65  0.49 0.37 0.55 0.12 0.50 2.71           5.49
  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    6.03
  Percent of Normal    9 125  94 84 120 18 55 191           91
Snowfall   T 1.1 6.9 5.5 7.3 0.0 T 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   41.3 33.2 23.0 24.7 16.5 33.0 39.9 53.4           33.1
  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   31.5
  Departure from Avegage   --1.3 4.0 2.4 7.0 -6.2 2.8 0.1 4.3           1.6
  Rank: Warm to Cold (124 yrs)    84 23 46 15 109 34 65 8           29
  Rank: Cold to Warm (124 yrs)    41 102 79 110 16 91 60 117           95
  Precipitation   0.79 1.46 1.16 0.63 1.42 1.02 1.74 3.34           11.56
  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   9.72
  Percent of Average   69 154 133 68 189 91 99 150           119
  Rank: Dry to Wet (124 yrs)   41 105 92 37 117 59 74 109           102
  Rank: Wet to Dry (124 yrs)   84 20 33 88 8 66 51 16           22
    

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           3.84
  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    4.35
  Percent of Normal     0 70 79 4 144 83 151 118           88
                               
Worland Airport None   0.23 0.68 0.44 0.15 0.17 0.66 1.30 2.00           5.63
  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    4.43
  Percent of Normal     33 194 191 65 89 143 151 141           127
                               
Cody  None   0.59 1.04 0.84 0.37 0.51 0.27 1.35 4.06           9.03
  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    5.80
  Percent of Normal     66 217 255 112 155 48 127 223            156
Snowfall    1.0 6.6 9.0 2.0 8.0 1.3 6.6 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           73
                               
Powell Field Station   None   0.01 0.25 0.19 0.08 0.31 0.10 0.74 2.13           3.81
  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    3.41
  Percent of Normal     2 139 146 38 238 34 145 152           112
Snowfall    0.0 0.8 2.0 3.0 5.5 T 3.2 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            145
                               
Thermopolis   None   0.70 0.65 0.70 0.39 0.27 0.64 1.16 3.19           7.70
  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   7.51
  Percent of Normal     56 81 152 111 60 74 79 172           103
Snowfall   0.0 8.0 11.6 4.5 6.0 1.0 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           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   43.2 35.1 23.2 25.2 15.9 33.0 40.6 55.2           33.9
  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   33.1
  Departure from Avegage   -1.4 4.1 0.9 5.6 -7.9 1.9 -0.6 4.4           0.8
  Rank: Warm to Cold (124 yrs)   85 29 70 24 112 46 54 9           48
  Rank: Cold to Warm (124 yrs)   40 96 55 101 13 79 71 116           76
  Precipitation   0.79 0.84 0.72 0.56 1.07 1.39 1.20 2.79           9.36
  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   9.26
  Percent of Average    68 109 111 89 175 132 65 110           101
  Rank: Dry to Wet (124 yrs)   41 81 83 61 116 93 33 78           67
  Rank: Wet to Dry (124 yrs)   84 44 42 64 9 32 92 47           57
    

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           6.24
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   7.39
  Percent of Normal     29  113 80 29 63  101  56 120            84
                               
Sheridan Arpt None   0.34 1.54 1.11 0.63 1.53  1.50  1.83 3.57           12.05
  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   8.71
  Percent of Normal     24 217 198 113 283  153  114 152            138
                               
Kaycee None   1.34 0.76 0.38 0.34 0.64  0.72 0.42 2.05           6.65
  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    7.13
  Percent of Normal     129 133 123 113 188  97 29 86            93
Snowfall    1.0 7.5 9.3 5.5 14.0  5.0 4.0 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   37.2
  Percent of Normal     67  179 155 93 222  63 85 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   43.8 35.2 21.7 23.3 13.2 31.8 39.4 56.4           33.1
  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   32.9
  Departure from Avegage   -1.2 4.2 -0.4 4.3 -9.9 1.2 -2.0 5.1           0.2
  Rank: Warm to Cold (124 yrs)   82 26 75 36 117 56 92 9           59
  Rank: Cold to Warm (124 yrs)   43 99 50 89 8 69 33 116           65
  Precipitation   0.88 0.61 0.92 0.63 1.34 1.73 1.54 2.75           10.40
  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    9.04
  Percent of Average    77 88 144 107 227 177 88 103           115
  Rank: Dry to Wet (124 yrs)   69 63 96 89 122 114 59 78           88
  Rank: Wet to Dry (124 yrs)   56 62 29 46 3 11 66 47           36
    

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           8.95
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    7.88
  Percent of Normal     88 89 178 177 282 194 69 79           114
                               

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   44.7 36.4 22.6 23.4 16.2 35.2 40.8 56.8           34.5
  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   34.1
  Departure from Avegage   -1.1 4.6 -0.4 3.1 -8.4 3.1 -1.7 4.4           0.4
  Rank: Warm to Cold (124 yrs)   84 18 75 43 113 36 88 8           51
  Rank: Cold to Warm (124 yrs)   40 106 49 82 12 89 37 117           73
  Precipitation   0.78 0.56 0.57 0.58 0.80 1.05 1.13 4.11           9.71
  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   7.83
  Percent of Average    82 102 119 138 174 138 67 162           124
  Rank: Dry to Wet (124 yrs)   53 74 91 96 109 97 40 110           105
  Rank: Wet to Dry (124 yrs)   71 50 33 29 16 28 85 15           19
    

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 39.3 27.1 28.8 23.0 36.4 42.1             34.4
  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   32.0
  Departure from Avegage   -1.2 7.0 2.4 6.0 -2.9 4.3 0.9             2.4
  Rank: Warm to Cold (124 yrs)   88 4 35 12 90 25 55             16
  Rank: Cold to Warm (124 yrs)    36 120 89 113 35 100 70             108
  Precipitation   0.85 0.53 0.58 0.53 0.49 1.17 1.02 3.99           9.03
  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   8.88
  Percent of Average   81 78 92 104 83 121 54 156           102
  Rank: Dry to Wet (124 yrs)   49 48 64 73 44 86 25 108           66
  Rank: Wet to Dry (124 yrs)   75 76 60 52 81 39 100 17           58
    

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           8.95
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    7.57
  Percent of Normal     97 41 280 133 109 122 80 142            118
Snowfall   5.6  3.6 19.4 12.3 18.6 6.5 5.7 T           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   73.0
  Percent of Normal     76 35 176 135 190 60 49 0            98
                               
Cheyenne Arpt None   1.13 0.44 0.57 0.57 0.34 1.01 0.94 4.10           9.10
  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   7.98
  Percent of Normal     122 75 114 173 72 96 53 175            114
Snowfall    8.0 4.2 13.0 7.4 5.3 6.6 7.1 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           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 33.0 22.5 23.6 18.3 32.1 39.4             29.9
  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   28.0
  Departure from Avegage   -1.5 5.1 3.0 6.3 -3.7 3.1 1.1             1.9
  Rank: Warm to Cold (124 yrs)    88 15 35 16 98 33 47             21
  Rank: Cold to Warm (124 yrs)   36 109 89 109 27 92 78             103
  Precipitation   0.92 1.65 1.38 0.67 1.20 1.12 1.26 3.67           11.92
  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   10.14
  Percent of Average    77 172 164 72 148 89 67 163           118
  Rank: Dry to Wet (124 yrs)   49 110 107 42 108 60 37 108           98
  Rank: Wet to Dry (124 yrs)   75 14 17 83 17 65 88 17           26
    

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           11.02
  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   8.95
  Percent of Normal     83 52 212 166 162 94 80 185            123
Snowfall    4.5 3.5 18.4 11.5 9.3 8.1 2.7 T           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    88.6
  Percent of Normal     46 27 182 151 90 50 16 0           65
                               
Riverton Airport  None   0.61 0.54 0.64 0.38 0.78 0.73 1.26 2.85           7.79
  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   5.79
  Percent of Normal     69 108 200 158 289 133 97 166           135
Snowfall    2.7 4.6 11.6 5.7 12.0 7.5 4.2 T           48.3
                               
Dubois  None   0.95 1.70 0.74 0.22 0.52 0.56 1.26 3.20           9.15
  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    5.42
  Percent of Normal     117 298 264 92 137 140 115 195             169
Snowfall    13.0 17.1 10.7 3.2 7.6 5.6 8.5 2.0           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   41.9
  Percent of Normal     433 295 210 82 133 93 100 51           162
                               
Riverton  None   0.53 0.44 0.66 0.44 0.70 0.79 0.48 3.63           7.67
  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    5.10
  Percent of Normal     62 107 275 157 212 141 49 250             150
Snowfall    1.3 3.6 11.2 5.9 10.5 9.7 1.8 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           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   40.2 35.9 24.8 25.9 21.0 32.1 39.5 51.7           34.1
  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   30.4
  Departure from Avegage   -1.6 7.6 4.6 7.6 -0.7 4.1 2.0 4.3           3.7
  Rank: Warm to Cold (124 yrs)   91 5 17 6 72 26 40 7           6
  Rank: Cold to Warm (124 yrs)   33 119 107 119 53 99 85 118           118
  Precipitation   0.68 0.83 0.77 0.67 0.78 0.91 0.82 1.61           7.09
  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   8.79
  Percent of Average    62 100 94 84 94 86 52 90           81
  Rank: Dry to Wet (124 yrs)   36 63 60 45 60 50 18 58           17
  Rank: Wet to Dry (124 yrs)   88 61 64 80 65 75 107 67           107
    

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           5.18
  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    6.62
  Percent of Normal    24 44 148 184 110 63 31 115           78
Snowfall   4.0 1.0 8.0 8.5 4.0 5.0 3.0 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    55.2
  Percent of Normal    55 15 145 185 60 53 29 0            61

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Annual
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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 June 2018 will be available on July 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) 7.87  Statewide Average (°F) 33.7
 20th Century Average 7.27  20th Century Average 31.4
 Rank - Driest  to Wettest  (123 Years) 83  Rank - Warmest  to Coldest (123 Years) 22
 Rank - Wettest to Driest (123 Years) 42  Rank - Coldest to Warmest (123 Years) 103
 Driest Period on Record: Jan - May 1919 4.22  Warmest Period on Record:  Jan - May 1934 38.0
 Wettest Period on Record: Jan - May 2011 10.60  Coldest Period on Record: Jan - May 1917 25.4

 

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) 16.35  Statewide Average (°F) 42.9
 20th Century Average 15.93  20th Century Average 40.7
 Rank - Driest  to Wettest  (123 Years) 75  Rank - Warmest  to Coldest (123 Years) 12
 Rank - Wettest to Driest (123 Years) 49  Rank - Coldest to Warmest (123 Years) 112
 Driest Period on Record: Jun 1933 - May 1934 10.01  Warmest Period on Record:  Jun 1933 - May 1934 45.7

 Wettest Period on Record: Jun 1998 - May 1999

21.27  Coldest Period on Record: Jun 1916 - May 1917 36.4

Last 5 Years (Jun 2013 - May 2018)

Precipitation - Percent of Normal Temperature - Departure from Normal
Map Not Available For This Period Map Not Available For This Period
 Statewide Average (inches) 88.62  Statewide Average (°F) 43.2
 20th Century Average 79.48  20th Century Average  40.7
 Rank - Driest  to Wettest  (119 Periods) 115  Rank - Warmest  to Coldest (119 Periods) 1
 Rank - Wettest to Driest  (119 Periods) 5  Rank - Coldest to Warmest (119 Periods) 119
 Driest Period on Record: Jun 1999 - May 2004 65.72  Warmest Period on Record: Jun 2013 - May 2018 43.2
 Wettest Period on Record: Jun 1994 - May 1999 92.31  Coldest Period on Record: Jun 1912 - May 1917 39.0