Counties in Idaho by average annual temperature

Canyon County had the highest average annual temperature of 44 counties in 2021, at 54.1 °F. Custer County had the lowest, at 40 °F. The median was 46.5 °F and the figure for Idaho was 45.4 °F. Source: NOAA National Centers for Environmental Information.

Highest54.1Canyon County

Lowest40Custer County

Median46.544 counties

Idaho45.4History

Map of counties, 2021

Under 43
43 to 44
44 to 46
46 to 48
48 to 50
50 and over

°F, 2021. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

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

Full ranking

Rank	Counties	2021 °F	Change on 2020
1	Canyon County	54.1	+2.7%
2	Payette County	53.8	+3.1%
3	Ada County	53.7	+2.5%
4	Jerome County	51.9	+2.6%
5	Gooding County	51.8	+2.6%
6	Gem County	50.8	+2.2%
7	Nez Perce County	50.7	+2.4%
8	Lincoln County	49.8	+3.1%
9	Twin Falls County	49.7	+2.3%
10	Owyhee County	49.6	+2.1%
10	Washington County	49.6	+1.6%
12	Elmore County	49.4	+2.1%
13	Minidoka County	49	+2.9%
14	Cassia County	48.2	+2.1%
15	Latah County	47.9	+1.7%
16	Oneida County	47.7	+1.9%
17	Power County	47.6	+2.8%
18	Kootenai County	47.5	+1.9%
19	Bannock County	47.3	+2.4%
19	Benewah County	47.3	+1.7%
19	Lewis County	47.3	+2.6%
22	Bingham County	46.5	+3.6%
23	Franklin County	46.4	+2.4%
24	Boise County	45.4	+2.7%
25	Adams County	45.2	+1.8%
26	Bonner County	45.1	+1.1%
27	Clearwater County	45	+1.4%
28	Jefferson County	44.9	+4.2%
29	Madison County	44.6	+3.5%
30	Blaine County	44.2	+2.8%
31	Shoshone County	44.1	+1.4%
32	Bonneville County	43.7	+3.3%
33	Camas County	43.5	+1.9%
33	Caribou County	43.5	+2.6%
35	Boundary County	43.2	+1.4%
35	Idaho County	43.2	+1.9%
37	Butte County	43.1	+4.4%
38	Bear Lake County	42.5	+3.4%
39	Clark County	41.6	+3%
39	Teton County	41.6	+2%
41	Fremont County	41.3	+3.2%
42	Lemhi County	41.2	+3.3%
43	Valley County	41.1	+2.8%
44	Custer County	40	+2.6%

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, 2021) [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, 2021. 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?period=2021. 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, 2021. 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?period=2021.

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, 2021 [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?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_idaho_by_2021,
  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, 2021}},
  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?period=2021. 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, 2021
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?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties?period=2021.
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 2021, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Custer County, with 40 °F in 2021.

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.