Average Annual Precipitation for Idaho





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. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

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
84 Idaho Falls 10.1 256
65 Malad City 13.1 333
105 Pocatello 13.5 342
94 Preston 17.3 439
82 Saint Anthony 14.8 376

Central Idaho

Annual averages for rainfall plus snowfall
Days Place Inches Milli­metres
84 Craters of the Moon Monument 15.0 381
84 Ketchum 17.3 440
66 Lake Walcott, Minidoka Dam 9.8 249
108 Middle Fork Lodge 15.9 403
78 Salmon 9.5 241
136 St. Maries 31.1 790
125 Stanley, Sawtooth Recreation Area 17.9 454
86 Twin Falls 10.8 274

Southwestern Idaho

Average amount of rain and snow a year
Days Place Inches Milli­metres
89 Boise 11.5 292
100 Brownlee Reservoir Dam 14.8 377
51 Bruneau 7.4 187
88 Idaho City 21.1 536
72 Lake Lowell, Deer Flat Dam 10.0 254
127 McCall 25.0 634

Northern Idaho

Average annual precipitation
Days Place Inches Milli­metres
114 Bonners Ferry 21.1 535
122 Coeur d’Alene 25.4 644
154 Elk City 30.6 778
159 Kellogg 33.9 861
106 Lewiston 12.9 327
136 Moscow 27.8 706
109 Porthill 21.5 546
116 Riggins 17.4 443
134 Sandpoint 34.0 864
151 Wallace 37.2 945
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Idaho Precipitation
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