Counties in Idaho by average annual temperature
Canyon County had the highest average annual temperature of 44 counties in 2018, at 53 °F. Custer County had the lowest, at 39.1 °F. The median was 45.8 °F and the figure for Idaho was 44.5 °F. Source: NOAA National Centers for Environmental Information.
Map of counties, 2018
- Under 42
- 42 to 44
- 44 to 46
- 46 to 47
- 47 to 49
- 49 and over
All counties, 2018
Full ranking
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
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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.
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, 2018 [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=2018 (Accessed: 12 October 2026).
BibTeX
@misc{noaa_counties_in_idaho_by_2018,
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, 2018}},
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=2018. 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, 2018
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=2018
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/idaho-counties?period=2018.
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 -
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=10Questions
Which county has the highest average annual temperature?
Canyon County, with 53 °F in 2018, according to NOAA National Centers for Environmental Information.
Which county has the lowest average annual temperature?
Custer County, with 39.1 °F in 2018.
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.
Average annual temperature: other rankings
Counties in Idaho: more rankings
- Share of days with good air quality (US EPA AQI)
- Social vulnerability score (FEMA National Risk Index)
- Expected annual loss from natural hazards (FEMA National Risk Index)
- Highest daily Air Quality Index (US EPA)
- GDP per capita, US dollars
- Real GDP growth
- Gross domestic product (GDP), US dollars
- County house price index, 1990 = 100