Average Annual Precipitation for Idaho

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

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: Eastern, Central, Southwestern and Northern Idaho.

Eastern Idaho

Average yearly precipitation
Days Place Inches Millimetres
  – Driggs 17.1 435
  87 Idaho Falls 10.4 264
106 Island Park 26.2 666
  83 Malad City 13.2 336
104 Pocatello 13.6 345
  93 Preston 17.5 444
  88 Saint Anthony 14.5 369

Central Idaho

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
  80 Craters of the Moon Monument 15.6 396
  68 Grouse 13.7 347
  88 Ketchum 18.0 456
  73 Lake Walcott, Minidoka Dam   9.5 242
105 Middle Fork Lodge 16.1 409
  88 Salmon   9.5 242
  55 Stanley, Sawtooth Recreation Area 12.3 311
  88 Twin Falls 11.1 282

Southwestern Idaho

Average amount of rain and snow a year
Days Place Inches Millimetres
  88 Boise 11.7 298
100 Brownlee Reservoir Dam 16.0 406
  49 Bruneau   7.6 194
  90 Idaho City 22.4 569
  74 Lake Lowell, Deer Flat Dam 10.0 253
123 McCall 25.7 653
  73 Mountain Home 10.6 268

Northern Idaho

Average annual precipitation
Days Place Inches Millimetres
122 Coeur d’Alene 25.7 652
152 Elk City 30.7 779
162 Kellogg 33.8 857
103 Lewiston 12.3 313
133 Moscow 27.1 688
112 Porthill 20.8 528
154 Powell 37.7 957
106 Riggins 17.2 437
138 Sandpoint 33.9 861
153 Wallace 38.4 976
Reference

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

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