Average Annual Temperatures in Idaho





Average annual temperatures for cities, towns, parks and lakes throughout Idaho are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Eastern, Central, Southwestern and Northern Idaho.

The tables give the normals for maximum and minimum yearly temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Eastern Idaho

Average annual temperatures
High °F Low °F Place High °C Low °C
56 28 Driggs 14 -2
58 31 Idaho Falls 14 -1
50 23 Island Park 10 -5
61 33 Malad City 16 0
62 38 Pocatello 17 4
60 34 Preston 16 1
55 31 Saint Anthony 13 -1

Central Idaho

Average temperatures for the year
High °F Low °F Place High °C Low °C
52 27 Craters of the Moon Monument 11 -3
54 27 Ketchum 12 -3
62 35 Lake Walcott, Minidoka Dam 17 2
59 31 Middle Fork Lodge 15 0
58 31 Salmon 14 0
59 37 St. Maries 15 3
52 16 Stanley, Sawtooth Recreation Area 11 -9
61 37 Twin Falls 16 3

Southwestern Idaho

Average yearly temperatures
High °F Low °F Place High °C Low °C
64 42 Boise 18 6
66 44 Brownlee Reservoir Dam 19 7
69 42 Bruneau 20 5
59 28 Idaho City 15 -2
65 40 Lake Lowell, Deer Flat Dam 18 5
55 28 McCall 13 -2
66 39 Mountain Home 19 4

Northern Idaho

Annual average temperature
High °F Low °F Place High °C Low °C
58 37 Bonners Ferry 15 3
58 40 Coeur d’Alene 15 4
57 27 Elk City 14 -3
59 34 Kellogg 15 1
64 43 Lewiston 18 6
60 33 Moscow 15 1
56 34 Mullan 13 1
60 35 Porthill 15 2
55 30 Powell 13 -1
64 37 Riggins 18 3
57 36 Sandpoint 14 2
56 36 Wallace 13 2
Reference

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

Idaho Temperatures
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