Counties in Idaho by average annual temperature, 2025

Canyon County had the highest average annual temperature of 44 counties in 2025, at 54.1 °F. Custer County had the lowest, at 40.2 °F. The median was 47.3 °F and the figure for Idaho was 45.9 °F. Source: NOAA National Centers for Environmental Information.

Highest54.1Canyon County

Lowest40.2Custer County

Median47.344 counties

Idaho45.9History

All counties, 2025

°F. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2025 °F	Change on 2024
1	Canyon County	54.1	+1.1%
2	Ada County	53.9	+1.5%
3	Payette County	53.4	+0.6%
4	Jerome County	52.2	+1.8%
5	Gooding County	51.8	+1.4%
6	Nez Perce County	51.6	+1.2%
7	Gem County	51.3	+1.6%
8	Washington County	50.5	+2%
9	Twin Falls County	50.3	+1.8%
10	Owyhee County	49.9	+1.6%
11	Lincoln County	49.7	+1.2%
12	Minidoka County	49.4	+1.4%
13	Elmore County	48.9	-0.2%
13	Oneida County	48.9	+1.2%
15	Cassia County	48.8	+1.7%
15	Latah County	48.8	+1.7%
17	Lewis County	48.7	+1.9%
18	Power County	48.4	+2.5%
19	Benewah County	48.3	+1.7%
20	Kootenai County	48.1	+2.1%
21	Bannock County	47.6	+1.5%
22	Franklin County	47.3	+2.6%
23	Bingham County	47.2	+1.1%
24	Jefferson County	46.3	+0.4%
25	Clearwater County	45.7	+1.8%
26	Adams County	45.5	+0.7%
26	Madison County	45.5	+0.9%
28	Bonner County	45.4	+0.7%
29	Boise County	45.2	+0.4%
30	Bonneville County	44.8	+1.1%
31	Shoshone County	44.5	+0.7%
32	Blaine County	44.4	+0.9%
33	Idaho County	44.1	+2.6%
34	Caribou County	43.9	+1.9%
35	Butte County	43.8	+0.5%
36	Boundary County	43.2	0%
36	Camas County	43.2	0%
38	Bear Lake County	42.9	+2.1%
39	Clark County	42.5	+0.7%
40	Fremont County	42.2	+1%
40	Teton County	42.2	+1.9%
42	Lemhi County	41.6	+0.7%
43	Valley County	41	+0.7%
44	Custer County	40.2	0%

Other periods

About this ranking

Mean air temperature from January to December, in degrees Fahrenheit: the average of the 12 monthly mean temperatures. NOAA computes it from its climate divisional dataset (nClimDiv): station readings interpolated onto a 5 km grid and averaged over the area.

Values are area averages, so a county with mountains and valleys has one value for very different local climates. NOAA revises the last two years every month.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

NOAA National Centers for Environmental Information. (2026). NOAA Climate at a Glance, January to December average temperature, counties (Counties in Idaho by average annual temperature, 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping

MLA 9

NOAA Climate at a Glance, January to December average temperature, counties, Counties in Idaho by average annual temperature, 2025. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December average temperature, counties. Counties in Idaho by average annual temperature, 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Also distributed by Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Counties in Idaho by average annual temperature, 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/rankings/average-annual-temperature/idaho-counties (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_idaho_by_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Counties in Idaho by average annual temperature, 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - NOAA National Centers for Environmental Information
TI  - NOAA Climate at a Glance, January to December average temperature, counties: Counties in Idaho by average annual temperature, 2025
PY  - 2026
DA  - 2026/10/06
PB  - NOAA National Centers for Environmental Information
DB  - Invokely
UR  - https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
L2  - https://invokely.ai/rankings/average-annual-temperature/idaho-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties.
N1  - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.
ER  -

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Questions

Which county has the highest average annual temperature?

Canyon County, with 54.1 °F in 2025, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Custer County, with 40.2 °F in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December average temperature, counties. Retrieved 2026-10-12.