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A powerful storm system will continue to bring heavy mountain snow, rain, and high winds to the Pacific Northwest and northern California through midweek. Heavy rain and flash flooding potential exists across the central Gulf Coast over the next few days, including the Florida Panhandle. A Slight Risk (level 2 of 4) of excessive rainfall is in effect Tuesday. Read More >

Western and Central Wyoming

Weather Forecast Office

2017-18 - Wyoming Water Year Climate Summary

Weather.gov > Western and Central Wyoming > 2017-18 - Wyoming Water Year Climate Summary
2018
Annual		 2017-18
Water Year		 2017
Annual		 2016-17
Water Year		 2016
Annual		 2015-16
Water Year		 2015 Annual
2014-15
Water Year		 2014 Annual 2013-14
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Previous Annual and Water Year Climate Summaries

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 25.2 19.2 32.4 39.7 52.9 60.2 67.3 63.5 57.3   43.1
  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   40.8
  Departure from Average   -1.4 5.7 3.2 6.8 -3.1 3.3 0.9 4.5 2.6 2.0 0.1 3.7   2.4
  Rank: Warm to Cold (124 yrs)    89 8 28 8 98 32 52 7 28 27 65 12   12
  Rank: Cold to Warm (124 yrs)    35 116 96 117 27 93 73 118 97 98 60 113   112
  Precipitation    0.78 1.48 1.01 0.90 1.23 1.35 1.46 3.03 2.10 1.21 0.95 0.45   15.95
  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   15.93
  Percent of Average    65 144 100 85 127 108 82 134 114 95 89 36   100
  Rank: Dry to Wet (124 yrs)   33 106 66 47 102 78 48 22 84 73 60 12   60
  Rank: Wet to Dry (124 yrs)   92 19 59 78 23 47 77 103 41 52 65 113   64
    
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 28.1 19.7 22.7 16.4 27.2 34.7 47.5 51.4 60.3 56.8 50.2   37.6
  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   35.4
  Departure from Avegage   -1.1 3.5 2.8 7.5 -2.5 2.9 1.4 5.1 1.1 2.4 0.6 2.8   2.2
  Rank: Warm to Cold (124 yrs)    85 24 32 6 95 37 45 6 42 18 55 24   11
  Rank: Cold to Warm (124 yrs)    39 100 94 119 30 88 80 119 83 107 70 101   113
  Precipitation    1.37 5.51 2.86 2.92 3.91 2.52 4.06 3.14 4.00 0.53 1.72 0.48   33.02
  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    27.56
  Percent of Average    73 221 109 101 173 97 164 111 156 33 114 27   120
  Rank: Dry to Wet (124 yrs)   40 119 73 71 117 59 119 82 110 8 87 11   111
  Rank: Wet to Dry (124 yrs)   84 5 51 54 8 66 6 43 15 117 38 114   13
    
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 0.19   28.36
  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    25.37
  Percent of Normal     98 239 66 116 177 117 115 69 162 37 95 13   112
Snowfall    8.5 45.5 43.5 40.5 57.5 27.5 12.0 0.0 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    207.8
  Percent of Normal     110 144 99 108 185 103 62 0 0 0 0 0   113
                               
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   35.3 27.9 19.7 22.0 18.7 25.4 34.7 46.2 51.2 59.8 56.4 50.3   37.3
  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   35.1
  Departure from Avegage   -2.1 3.5 3.7 7.3 0.4 1.8 1.7 3.9 1.2 2.1 0.4 2.8   2.2
  Rank: Warm to Cold (124 yrs)    94 24 21 3 59 47 40 8 41 20 56 17   7
  Rank: Cold to Warm (124 yrs)    30 100 103 122 66 78 85 117 84 105 69 108   117
  Precipitation    1.63 6.35 2.48 3.73 3.71 4.27 4.74 3.89 2.76 0.50 1.40 0.16   35.62
  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    33.13
  Percent of Average   77 191 67 86 103 123 169 134 119 38 96 9   108
  Rank: Dry to Wet (124 yrs)   46 115 31 55 79 33 121 103 88 13 70 1   81
  Rank: Wet to Dry (124 yrs)   78 9 93 70 46 92 4 22 37 112 55 124   43
   
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 0.01   17.67
  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   18.16
  Percent of Normal    39 191 114 101 118 164 149 115 80 48 49 1   97
Snowfall    2.4 5.7 19.6 16.2 11.8 23.1 7.2 T 0.0 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 0.01   23.24
  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    21.80
  Percent of Normal    68 146 50 63 117 178 203 146 165 43 109 1   107
Snowfall    4.1  13.6 15.9 23.4 19.4 22.1 14.2 T 0.0 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    162.8
  Percent of Normal     85 56 36 63 73 139 192 0 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 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    367.0
  Percent of Normal     129 206 68  79 97 118 300 54 0 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   39.0 33.5 24.8 24.8 21.2 30.9 39.4 50.8 58.6 66.2 62.0 55.9   43.3
  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   38.6
  Departure from Avegage   -1.7 6.5 6.5 8.6 1.5 3.9 2.4 4.2 3.3 3.4 1.2 4.3   3.7
  Rank: Warm to Cold (124 yrs)    94 4 9 5 55 27 34 9 19 10 37 5   4
  Rank: Cold to Warm (124 yrs)    30 120 115 120 70 98 91 116 106 115 88 120   120
  Precipitation    0.35 1.37 0.86 0.78 1.02 1.10 1.02 2.03 0.94 0.44 0.66 0.11   10.68
  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    13.70
  Percent of Average    30 133 83 68 96 94 74 131 82 47 66 10   78
  Rank: Dry to Wet (124 yrs)   13 93 49 41 71 66 39 98 66 16 42 2   20
  Rank: Wet to Dry (124 yrs)   111 31 75 84 54 59 86 27 59 109 83 123   104
    
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 1.66 0.22 0.49 T   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    6.48
Percent of Normal    2 119 23 16 0 61 70 219 210 31 71 0   81
                               
Evanston Airport D1   T 1.47 0.07 0.17 0.41 0.06 T 0.33 1.04 0.52 0.83 0.02   4.92
  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   12.13
  Percent of Normal     0 141 12 31 67 7 0 19 84 58 86 2   41
                               
Rock Springs Arpt.  D0   0.02 0.29  0.11 0.08 0.11 0.34 0.16 1.59 0.16 0.16 0.25 T   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    8.56
  Percent of Normal     2 59  22 18 23 50 18 131 20 25 40 0    38
                               
Bitter Creek 4NE D0   0.04 0.50 0.32 0.10 0.26 0.43 0.50 1.98 0.18 0.13 0.47 0.04   4.95
  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    6.94
  Percent of Normal     6 161  63 36 72 143 77 182 26 22 63 5   71
                               
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 T   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    11.00
  Percent of Normal    45 220  116 122 129 112 151 118 54 56 12 0   90
Snowfall    1.7 8.5  12.5 7.3 11.9 7.0 4.6 T 0.0 0.0 0.0 0.0    53.5
                               
Green River D0   0.07 0,80  0.60 0.68 0.53 1.12 1.15 2.54 0.45 0.25 0.36 0.00   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    8.33
  Percent of Normal   9 195  136 200 123 158 135 207 46 45 53 0   103
Snowfall   T 4.5  6.3 6.8 6.9 6.7 0.8 0.0 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 0    99
                               
Rock Springs  D0   0.10 0.65  0.49 0.37 0.55 0.12 0.50 2.71 0.19 T 0.37 0.00   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   9.66
  Percent of Normal    9 125  94 84 120 18 55 191 22 0 39 0   63
Snowfall   T 1.1 6.9 5.5 7.3 0.0 T 0.0 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   41.4 33.3 22.9 24.9 16.6 33.2 40.1 53.6 60.2 68.0 63,9 56.7   42.9
  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   41.1
  Departure from Avegage   --1.2 4.1 2.3 7.2 -6.1 3.0 0.3 4.5 2.1 2.2 0.2 3.2   1.8
  Rank: Warm to Cold (124 yrs)    83 22 46 12 109 33 63 6 34 29 66 23   20
  Rank: Cold to Warm (124 yrs)    41 102 78 113 16 92 62 119 91 96 59 102   104
  Precipitation   0.79 1.46 1.16 0.63 1.42 1.02 1.75 3.49 2.18 0.62 1.03 0.43   15.98
  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   15.02
  Percent of Average   69 154 133 68 189 91 100 157 114 55 110 33   106
  Rank: Dry to Wet (124 yrs)   41 105 92 37 117 59 74 110 86 30 88 21   80
  Rank: Wet to Dry (124 yrs)   83 19 32 88 8 66 51 15 39 95 37 104   44
    
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 0.25   6.19
  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    7.51
  Percent of Normal     0 70 79 4 144 83 151 118 100 24 176 28   82
                               
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 0.05   7.26
  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    7.57
  Percent of Normal     33 194 191 65 89 143 151 141 70 32 126 6   96
                               
Cody  None   0.59 1.04 0.84 0.37 0.51 0.27 1.35 4.06 2.21 0.58 1.35 0.26   13.43
  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    10.56
  Percent of Normal     66 217 255 112 155 48 127 223 132 52 148 25   127
Snowfall    1.0 6.6 9.0 2.0 8.0 1.3 6.6 0.0 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   47.3
  Percent of Normal     23 105 113 26 119 19 105 0 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 0.16   7.00
  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    6.80
  Percent of Normal     2 139 146 38 238 34 145 152 146 13 183 25   103
Snowfall    0.0 0.8 2.0 3.0 5.5 T 3.2 0.0 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   10.1
  Percent of Normal     0  62 167 130 1100 0 640 0 0 0 0 0    144
                               
Thermopolis   None   0.70 0.65 0.70 0.39 0.27 0.64 1.16 3.19 2.11 0.50 0.42 0.06   10.79
  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   11.71
  Percent of Normal     56 81 152 111 60 74 79 172 140 57 72 5   92
Snowfall   0.0 8.0 11.6 4.5 6.0 1.0 0.0 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   26.7
  Percent of Normal     0 216 258 80 130 40 0 0 0 0 0 0   116
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 35.2 23.3 25.6 16.0 33.1 40.5 55.5 62.2 69.8 65.9 58.1   44.0
  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   42.9
  Departure from Avegage   -1.3 4.2 1.0 6.0 -7.8 2.0 -0.7 4.7 2.0 1.6 -0.6 2.2   1.1
  Rank: Warm to Cold (124 yrs)   83 27 69 24 111 43 72 9 36 40 76 33   37
  Rank: Cold to Warm (124 yrs)   41 97 55 101 14 82 55 116 89 85 49 92   87
  Precipitation   0.79 0.84 0.72 0.56 1.07 1.39 1.21 2.82 2.70 1.54 1.09 0.80   15.53
  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   15.28
  Percent of Average    68 109 111 89 175 132 65 111 115 110 110 63   102
  Rank: Dry to Wet (124 yrs)   41 81 83 61 116 93 35 78 86 84 81 46   65
  Rank: Wet to Dry (124 yrs)   84 43 41 64 9 32 90 47 39 41 44 79   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                              
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 0.97   11.61
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   13.45
  Percent of Normal     29  113 80 29 63  101  56 120 73 108 116 74    86
                               
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 1.21   17.20
  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   14.16
  Percent of Normal     24 217 198 113 283  153  114 152 67 103 181 85    121
                               
Kaycee None   1.34 0.76 0.38 0.34 0.64  0.72 0.42 2.05 2.78 0.38 1.26 0.32   11.39
  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    12.37
  Percent of Normal     129 133 123 113 188  97 29 86 151 27 158 27   92
Snowfall    1.0 7.5 9.3 5.5 14.0  5.0 4.0 0.0 0.0 0.0 0.0 1.0   47.3
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   37.5
  Percent of Normal     67  179 155 93 222  63 85 0 0 0 0 500   126
                               
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 21.8 23.4 13.5 32.0 39.2 56.9 63.1 69.4 66.0 58.4   43.6
  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   43.1
  Departure from Avegage   -1.0 4.2 -0.3 4.4 -9.6 1.4 -2.2 5.6 2.2 0.6 -1.0 2.0   0.5
  Rank: Warm to Cold (124 yrs)   80 25 74 36 116 53 94 8 35 57 81 40   50
  Rank: Cold to Warm (124 yrs)   44 99 50 89 9 72 31 117 90 68 44 85   74
  Precipitation   0.88 0.61 0.92 0.63 1.34 1.74 1.54 3.36 4.15 3.29 1.88 0.85   21.19
  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    16.36
  Percent of Average    77 88 144 107 227 178 88 126 147 179 141 64   130
  Rank: Dry to Wet (124 yrs)   55 63 96 89 122 114 59 89 109 115 98 47   112
  Rank: Wet to Dry (124 yrs)   69 61 28 46 3 11 66 36 16 10 27 78   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 1.12   18.52
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    13.89
  Percent of Normal     88 89 178 177 282 194 69 79 216 90 229 94   133
                               
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 16.3 34.8 41.0 57.1 64.6 70.1 66.8 61.0   44.9
  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   44.3
  Departure from Avegage   -1.2 4.7 -0.4 2.7 -8.3 2.7 -1.5 4.7 2.1 -0.2 -1.6 3.4   0.6
  Rank: Warm to Cold (124 yrs)   84 20 75 51 113 39 85 8 36 69 91 19   48
  Rank: Cold to Warm (124 yrs)   40 104 49 74 12 86 40 117 89 56 34 106   76
  Precipitation   0.78 0.56 0.57 0.68 0.80 1.20 1.01 4.54 3.58 3.42 1.08 0.68   18.90
  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   14.30
  Percent of Average    82 102 119 162 174 158 60 179 153 192 89 60   132
  Rank: Dry to Wet (124 yrs)   53 74 91 105 109 103 30 113 113 118 56 43   118
  Rank: Wet to Dry (124 yrs)   71 50 33 20 16 22 95 12 12 7 69 82   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   43.9 39.5 27.2 28.7 23.1 36.4 42.1 55.3 64.0 69.4 65.8 61.4   46.4
  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   43.9
  Departure from Avegage   -1.3 7.2 2.5 5.9 -2.8 4.3 0.9 4.5 3.3 1.4 -0.4 5.0   2.5
  Rank: Warm to Cold (124 yrs)   88 4 34 13 89 25 55 5 21 41 70 4   10
  Rank: Cold to Warm (124 yrs)    36 120 90 112 36 100 70 120 104 84 55 121   114
  Precipitation   0.85 0.53 0.58 0.52 0.46 1.08 1.02 3.99 1.88 1.90 1.00 0.63   14.44
  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   14.89
  Percent of Average   81 78 92 102 78 111 54 156 92 120 85 52   97
  Rank: Dry to Wet (124 yrs)   49 48 64 70 41 79 25 108 65 89 52 38   52
  Rank: Wet to Dry (124 yrs)   75 76 60 55 84 46 100 17 60 36 73 87   72
    
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 0.28   12.81
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    12.52
  Percent of Normal     97 41 280 133 109 122 80 142 101 115 39 26    102
Snowfall   5.6  3.6 19.4 12.3 18.6 6.5 5.7 T 0.0 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   74.9
  Percent of Normal     76 35 176 135 190 60 49 0 0 0 0 0    96
                               
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 0.09   15.88
  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   15.94
  Percent of Normal     122 75 114 173 72 96 53 175 66 111 139 6    100
Snowfall    8.0 4.2 13.0 7.4 5.3 6.6 7.1 T T T T 0.0   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   60.3
  Percent of Normal     160 53 106 125 67 58 70 0 0 0 0 0   86
                               
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 33.4 23.1 24.6 18.9 32.2 39.3 51.5 58.8 66.7 63.0 56.4   42.4
  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   40.1
  Departure from Avegage   -1.5 5.5 3.6 7.3 -3.1 3.2 1.0 3.5 1.8 2.0 0.2 3.5   2.3
  Rank: Warm to Cold (124 yrs)    87 13 30 11 92 32 48 14 38 28 60 15   11
  Rank: Cold to Warm (124 yrs)   37 111 94 114 33 93 77 111 87 97 65 110   113
  Precipitation   0.92 1.65 1.37 0.68 1.20 1.14 1.29 3.69 2.10 0.72 0.52 0.20   15.48
  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   14.92
  Percent of Average    77 172 163 73 148 90 68 164 126 69 59 17   104
  Rank: Dry to Wet (124 yrs)   49 110 106 43 108 60 43 108 90 51 38 6   72
  Rank: Wet to Dry (124 yrs)   75 14 18 82 17 65 82 17 35 74 87 119   52
    
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 0.05   13.61
  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   12.66
  Percent of Normal     83 52 212 166 162 94 80 185 131 86 34 5    108
Snowfall    4.5 3.5 18.4 11.5 9.3 8.1 2.7 T 0.0 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    91.4
  Percent of Normal     46 27 182 151 90 50 16 0 0 0 0 0   63
                               
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 0.09   9.70
  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   9.43
  Percent of Normal     69 108 200 158 289 133 97 166 89 60 26 10   103
Snowfall    2.7 4.6 11.6 5.7 12.0 7.5 4.2 T T 0 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 0.10   13.52
  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    9.91
  Percent of Normal     117 298 264 92 137 140 115 195 225 59 86 8     136
Snowfall    13.0 17.1 10.7 3.2 7.6 5.6 8.5 2.0 0.0 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   45.1
  Percent of Normal     433 295 210 82 133 93 100 51 0 0 0 0   150
                               
Riverton  None   0.53 0.44 0.66 0.44 0.70 0.79 0.48 3.63 0.65 0.41 0.19 0.03   8.95
  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    8.42
  Percent of Normal     62 107 275 157 212 141 49 250 54 53 38 4     106
Snowfall    1.3 3.6 11.2 5.9 10.5 9.7 1.8 T T 0.0 T 0.0   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   37.1
  Percent of Normal     35 84 233 123 175 164 30 0 0 0 0 0   119
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 36.2 24.9 26.1 21.3 32.1 39.8 51.8 60.6 67.2 63.2 57.9   43.4
  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   40.0
  Departure from Avegage   -1.6 7.9 4.7 7.8 -0.4 4.1 2.3 4.4 3.5 2.7 0.6 5.0   3.4
  Rank: Warm to Cold (124 yrs)   91 5 13 6 69 26 36 6 19 20 51 4   6
  Rank: Cold to Warm (124 yrs)   33 119 111 119 56 99 89 119 106 105 74 121   118
  Precipitation   0.68 0.83 0.76 0.67 0.78 0.90 0.86 1.73 1.20 0.81 0.69 0.43   10.34
  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   13.19
  Percent of Average    62 100 93 84 94 86 54 97 94 74 73 40   78
  Rank: Dry to Wet (124 yrs)   36 63 57 45 60 50 19 67 64 37 43 17   16
  Rank: Wet to Dry (124 yrs)   88 61 67 80 65 75 106 58 61 88 82 108   108
    
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 T   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    10.06
  Percent of Normal    24 44 148 184 110 63 31 115 134 106 57 0   80
Snowfall   4.0 1.0 8.0 8.5 4.0 5.0 3.0 0.0 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    57.0
  Percent of Normal    55 15 145 185 60 53 29 0 0 0 0 0    59
 
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