Average 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

Average Annual Temperatures in Idaho

Eastern Idaho

Central Idaho

Southwestern Idaho

Northern Idaho

Reference

More Idaho Weather Information