Average Annual Precipitation for Wyoming

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The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Wyoming.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations also have information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

You can jump to a separate table for each region of the state: Northwest, Southwest, North - Central, Northeast and Southeast Wyoming.

Northwest Wyoming

Average yearly precipitation
Days Place Inches Millimetres
  93 Alta 25.3 642
  71 Cody 10.6 268
105 Jackson 16.8 428
129 Moose 21.8 554
125 Moran 24.7 626
151 Yellowstone Lake 20.9 531
119 Yellowstone Park, Mammoth 14.4 366
139 Yellowstone Park, Old Faithful 25.4 644

Southwest Wyoming

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
  70 Evanston 12.2 310
  59 Fontenelle Reservoir Dam   7.5 191
  – Fossil Butte Monument 11.0 279
  72 Kemmerer 10.4 263
  78 Rock Springs   8.6 217

North - Central Wyoming

Average amount of rain and snow a year
Days Place Inches Millimetres
  59 Boysen Reservoir Dam   8.9 226
  – Burgess Junction 20.1 511
  71 Lander 12.7 322
  54 Riverton   8.4 214
  – South Pass City 12.6 321
  83 Ten Sleep 13.6 345
  62 Thermopolis 11.7 297
  64 Worland   7.6 192

Northeast Wyoming

Average annual precipitation
Days Place Inches Millimetres
  74 Buffalo 13.2 336
  91 Devils Tower 18.0 457
  96 Gillette 16.9 430
101 Sheridan 14.2 360
102 Sundance 19.2 488

Southeast Wyoming

Annual precipitation totals
Days Place Inches Millimetres
  95 Casper 12.5 318
  93 Centennial 14.0 355
104 Cheyenne 15.9 405
  87 Douglas 15.6 396
  86 Laramie 10.9 277
  50 Muddy Gap 10.2 259
  85 Rawlins   9.3 235
  70 Torrington 14.4 365
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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