Counties in Iowa by average annual temperature

Fremont County had the highest average annual temperature of 99 counties in 2024, at 54.3 °F. Howard County had the lowest, at 48.3 °F. The median was 51.5 °F and the figure for Iowa was 51.5 °F. Source: NOAA National Centers for Environmental Information.

Highest54.3Fremont County

Lowest48.3Howard County

Median51.599 counties

Iowa51.5History

Map of counties, 2024

Under 50
50 to 51
51 to 52
52 to 53
53 and over

°F, 2024. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

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

Full ranking

Rank	Counties	2024 °F	Change on 2023
1	Fremont County	54.3	+2.3%
2	Lee County	54.2	+0.9%
3	Decatur County	53.9	+1.3%
3	Page County	53.9	+2.3%
5	Des Moines County	53.8	+0.9%
6	Appanoose County	53.7	+1.7%
6	Davis County	53.7	+1.3%
6	Louisa County	53.7	+1.1%
6	Marion County	53.7	+2.3%
6	Mills County	53.7	+1.9%
6	Monroe County	53.7	+1.9%
12	Ringgold County	53.6	+1.5%
12	Warren County	53.6	+1.9%
14	Clarke County	53.5	+1.3%
14	Scott County	53.5	+1.1%
14	Taylor County	53.5	+1.9%
14	Wayne County	53.5	+1.7%
18	Lucas County	53.4	+1.5%
18	Mahaska County	53.4	+1.9%
18	Wapello County	53.4	+1.3%
21	Van Buren County	53.3	+0.8%
22	Polk County	53.2	+2.1%
23	Henry County	53.1	+0.6%
23	Madison County	53.1	+1.5%
23	Montgomery County	53.1	+1.7%
26	Clinton County	52.9	+1.3%
26	Keokuk County	52.9	+1.9%
26	Union County	52.9	+1.7%
29	Jasper County	52.8	+1.9%
29	Jefferson County	52.8	+1.1%
29	Pottawattamie County	52.8	+1.3%
29	Washington County	52.8	+1.3%
33	Adams County	52.7	+1.9%
33	Dallas County	52.7	+1.7%
33	Muscatine County	52.7	+1%
36	Harrison County	52.5	+1.4%
37	Iowa County	52.3	+1.6%
37	Poweshiek County	52.3	+1.8%
39	Cass County	52.2	+1.6%
39	Johnson County	52.2	+1.2%
41	Story County	52.1	+2.2%
42	Adair County	52	+1.6%
42	Boone County	52	+2%
42	Jackson County	52	+1.8%
45	Shelby County	51.8	+1.6%
46	Cedar County	51.7	+0.4%
46	Guthrie County	51.7	+1.6%
46	Marshall County	51.7	+2%
49	Crawford County	51.5	+1.2%
49	Greene County	51.5	+1.4%
49	Linn County	51.5	+1.4%
49	Monona County	51.5	+0.8%
53	Carroll County	51.4	+1.6%
53	Jones County	51.4	+1.2%
55	Tama County	51.3	+1.6%
56	Black Hawk County	51.2	+1.8%
57	Audubon County	51.1	+1.4%
57	Sac County	51.1	+2.2%
59	Benton County	51	+1.4%
59	Calhoun County	51	+2.4%
59	Grundy County	51	+2%
62	Hardin County	50.9	+2.4%
63	Dubuque County	50.8	+2%
63	Woodbury County	50.8	+0.8%
65	Hamilton County	50.6	+2.6%
65	Ida County	50.6	+1.4%
65	Webster County	50.6	+2.2%
68	Butler County	50.5	+2.2%
68	Plymouth County	50.5	+2%
70	Buena Vista County	50.3	+3.3%
70	Pocahontas County	50.3	+3.7%
72	Bremer County	50.2	+1.8%
72	Buchanan County	50.2	+1.8%
72	Delaware County	50.2	+1.8%
72	Humboldt County	50.2	+2.7%
76	Cherokee County	50.1	+2.5%
76	Franklin County	50.1	+2.5%
78	Clay County	50	+3.7%
78	Palo Alto County	50	+4%
80	Clayton County	49.9	+1.8%
80	Kossuth County	49.9	+3.3%
82	O'Brien County	49.7	+3.3%
82	Sioux County	49.7	+3.1%
82	Wright County	49.7	+2.5%
85	Floyd County	49.5	+2.1%
86	Allamakee County	49.4	+2.3%
86	Cerro Gordo County	49.4	+2.3%
86	Hancock County	49.4	+2.7%
86	Winneshiek County	49.4	+2.7%
90	Emmet County	49.3	+3.8%
91	Fayette County	49.2	+2.1%
92	Chickasaw County	49.1	+2.1%
92	Lyon County	49.1	+3.6%
94	Dickinson County	49	+3.6%
95	Osceola County	48.9	+4%
96	Winnebago County	48.8	+2.7%
97	Worth County	48.7	+2.3%
98	Mitchell County	48.6	+1.9%
99	Howard County	48.3	+2.3%

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 Iowa by average annual temperature, 2024) [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 Iowa by average annual temperature, 2024. 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/iowa-counties?period=2024. 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 Iowa by average annual temperature, 2024. 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/iowa-counties?period=2024.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Counties in Iowa by average annual temperature, 2024 [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/iowa-counties?period=2024 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2024,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Counties in Iowa by average annual temperature, 2024}},
  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/iowa-counties?period=2024. 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 Iowa by average annual temperature, 2024
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/iowa-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2024.
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/iowa-counties?period=2024" width="760" height="500" title="Counties in Iowa by average annual temperature, 2024, 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 Iowa by average annual temperature using official data, and cite the source.

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

Fremont County, with 54.3 °F in 2024, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Howard County, with 48.3 °F in 2024.

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.