Counties in Idaho by average annual temperature

Canyon County had the highest average annual temperature of 44 counties in 2020, at 52.7 °F. Custer County had the lowest, at 39 °F. The median was 45.1 °F and the figure for Idaho was 44.3 °F. Source: NOAA National Centers for Environmental Information.

Highest52.7Canyon County

Lowest39Custer County

Median45.144 counties

Idaho44.3History

Map of counties, 2020

Under 41
41 to 43
43 to 45
45 to 47
47 to 49
49 and over

°F, 2020. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2020

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

Full ranking

Rank	Counties	2020 °F	Change on 2019
1	Canyon County	52.7	+2.1%
2	Ada County	52.4	+1.9%
3	Payette County	52.2	+1.8%
4	Jerome County	50.6	+3.7%
5	Gooding County	50.5	+3.5%
6	Gem County	49.7	+2.3%
7	Nez Perce County	49.5	+3.3%
8	Washington County	48.8	+3.4%
9	Owyhee County	48.6	+3.4%
9	Twin Falls County	48.6	+4.3%
11	Elmore County	48.4	+2.5%
12	Lincoln County	48.3	+3.6%
13	Minidoka County	47.6	+4.2%
14	Cassia County	47.2	+4.2%
15	Latah County	47.1	+3.3%
16	Oneida County	46.8	+4.9%
17	Kootenai County	46.6	+3.8%
18	Benewah County	46.5	+2.6%
19	Power County	46.3	+4%
20	Bannock County	46.2	+4.1%
21	Lewis County	46.1	+3.4%
22	Franklin County	45.3	+4.1%
23	Bingham County	44.9	+2.7%
24	Bonner County	44.6	+3.7%
25	Adams County	44.4	+3.5%
25	Clearwater County	44.4	+2.1%
27	Boise County	44.2	+2.3%
28	Shoshone County	43.5	+3.1%
29	Jefferson County	43.1	+0.5%
29	Madison County	43.1	+1.4%
31	Blaine County	43	+4.1%
32	Camas County	42.7	+4.1%
33	Boundary County	42.6	+3.9%
34	Caribou County	42.4	+3.9%
34	Idaho County	42.4	+2.7%
36	Bonneville County	42.3	+2.7%
37	Butte County	41.3	+2%
38	Bear Lake County	41.1	+4.3%
39	Teton County	40.8	+3%
40	Clark County	40.4	+3.1%
41	Fremont County	40	+2.3%
41	Valley County	40	+2.3%
43	Lemhi County	39.9	+2.8%
44	Custer County	39	+3.7%

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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_idaho_by_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties?period=2020.
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  -

Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Embed code

<iframe src="https://invokely.ai/embed/rankings/average-annual-temperature/idaho-counties?period=2020" width="760" height="500" title="Counties in Idaho by average annual temperature, 2020, chart from Invokely" loading="lazy" style="border:0;width:100%;max-width:760px" referrerpolicy="strict-origin-when-cross-origin"></iframe>

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Idaho by average annual temperature using official data, and cite the source.

rank_places {"indicator":"average_temperature_annual","level":"province","within":"Idaho","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=average_temperature_annual&level=province&within=Idaho&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest average annual temperature?

Canyon County, with 52.7 °F in 2020, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Custer County, with 39 °F in 2020.

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.