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Idaho Weather

Idaho enjoys a four-season climate, but weather conditions can be unpredictable, especially in the higher elevations of the mountains.

Along the Snake River Plain (or Valley) summers are generally warm (seldom hot). Evenings are cool, and July and August are considered perfect by most. In late fall the weather is much cooler and winter conditions can be snowy and much colder.

Across the southern reaches of the Snake River Plain summer high temperatures average near 75 degrees, while winter highs are in the low-40s. The average annual rainfall here approaches 26 inches.

In the mountains across the entire state weather conditions are cooler throughout the year, with cold and snowy conditions fall and winter.

The average summer high temperature across the State of Idaho is right at 64 degrees, dropping to around 30 degrees in winter.

The average rainfall in the higher elevations of the Rockies (central and north) exceeds 60 inches, and snowfall is usually heavy. For an interesting look at Idaho precipitation levels, view this precipitation map.
Seasonal Temperature Averages:
In these selected cities....

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High Temperatures ( Fahrenheit/Celsius )

(Jan) 37/3 (Feb) 40/4 (Mar) 49/9 (Apr) 58/14

(May) 67/19 (Jun) 77/25 (Jul) 87/30 (Aug) 91/33

(Sep) 84/29 (Oct) 71/22 (Nov) 57/14 (Dec) 41/5

Low Temperatures ( Fahrenheit/Celsius )

(Jan) 23/-5 (Feb) 27/-3 (Mar) 31/0 (Apr) 37/3

(May) 43/6 (Jun) 51/10 (Jul) 59/15 (Aug) 62/17

(Sep) 58/14 (Oct) 48/9 (Nov) 38/3 (Dec) 28/2

Current Weather Conditions:

Idaho Photographs

Dawn at Stanley Lake, Sawtooth Mountains, Near Stanley, Stanley, Idaho

Dawn at Stanley Lake...
by Holger Leue
Buy This at Allposters.com

Idaho Cities, Counties & Area Codes

City County Area Code
Boise Ada 208
Council Adams 208
Pocatello Bannock 208
Montpelier Bear Lake 208
Saint Maries Benewah 208
Blackfoot Bingham 208
Hailey Blaine 208
Garden Valley Boise 208
Sandpoint Bonner 208
Idaho Falls Bonneville 208
Bonners Ferry Boundary 208
Arco Butte 208
Fairfield Camas 208
Nampa Canyon 208
Soda Springs Caribou 208
Burley Cassia 208
Dubois Clark 208
Orofino Clearwater 208
Challis Custer 208
Mountain Home Elmore 208
Preston Franklin 208
Saint Anthony Fremont 208
Emmett Gem 208
Gooding Gooding 208
Grangeville Idaho 208
Rigby Jefferson 208
Jerome Jerome 208
Coeur d Alene Kootenai 208
Moscow Latah 208
Salmon Lemhi 208
Kamiah Lewis 208
Shoshone Lincoln 208
Rexburg Madison 208
Rupert Minidoka 208
Lewiston Nez Perce 208
Malad City Oneida 208
Homedale Owyhee 208
Payette Payette 208
American Falls Power 208
Kellogg Shoshone 208
Victor Teton 208
Twin Falls Twin Falls 208
McCall Valley 208
Weiser Washington 208

About the Author

John Moen is a cartographer who along with his wife are the orignal founders of worldatlas.com. He and his wife, Chris Woolwine-Moen, produced thousands of award-winning maps that are used all over the world and content that aids students, teachers, travelers and parents with their geography and map questions. Today, it's one of the most popular educational sites on the web.

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This page was last updated on April 7, 2017.