Counties in Iowa by average annual temperature

Fremont County had the highest average annual temperature of 99 counties in 2022, at 51.1 °F. Howard County had the lowest, at 43.6 °F. The median was 47.8 °F and the figure for Iowa was 47.5 °F. Source: NOAA National Centers for Environmental Information.

Highest51.1Fremont County

Lowest43.6Howard County

Median47.899 counties

Iowa47.5History

Map of counties, 2022

Under 45
45 to 46
46 to 48
48 to 49
49 to 50
50 and over

°F, 2022. 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, 2022

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

Full ranking

Rank	Counties	2022 °F	Change on 2021
1	Fremont County	51.1	-3.8%
2	Lee County	50.8	-3.6%
3	Decatur County	50.5	-3.6%
4	Mills County	50.4	-4.2%
4	Page County	50.4	-4.5%
6	Des Moines County	50.2	-4%
7	Davis County	50.1	-3.8%
8	Clarke County	50	-3.7%
8	Louisa County	50	-4%
8	Ringgold County	50	-4%
8	Taylor County	50	-4.2%
12	Appanoose County	49.9	-4%
12	Wapello County	49.9	-3.9%
14	Lucas County	49.8	-3.7%
14	Monroe County	49.8	-3.9%
14	Van Buren County	49.8	-3.7%
14	Wayne County	49.8	-3.9%
18	Montgomery County	49.7	-4.2%
18	Pottawattamie County	49.7	-4.2%
18	Scott County	49.7	-3.9%
21	Harrison County	49.6	-4.1%
21	Warren County	49.6	-4.1%
23	Henry County	49.5	-4.1%
24	Mahaska County	49.4	-3.9%
25	Adams County	49.3	-3.7%
25	Union County	49.3	-3.5%
27	Jefferson County	49.2	-3.9%
27	Madison County	49.2	-3.9%
29	Marion County	49.1	-4.5%
29	Polk County	49.1	-4.7%
29	Washington County	49.1	-4.1%
32	Clinton County	49	-4.3%
32	Keokuk County	49	-4.1%
32	Muscatine County	49	-3.7%
35	Monona County	48.9	-3.9%
36	Cass County	48.8	-4.1%
36	Dallas County	48.8	-4.9%
38	Jasper County	48.5	-4.9%
39	Adair County	48.4	-3.8%
39	Shelby County	48.4	-4.5%
41	Johnson County	48.3	-4%
42	Crawford County	48.2	-4.6%
42	Poweshiek County	48.2	-4.4%
42	Woodbury County	48.2	-3.8%
45	Cedar County	48.1	-4%
45	Iowa County	48.1	-4.2%
47	Guthrie County	48	-4.6%
48	Boone County	47.9	-5.3%
48	Story County	47.9	-5%
50	Jackson County	47.8	-4.8%
51	Audubon County	47.7	-4.4%
52	Carroll County	47.6	-5.4%
52	Greene County	47.6	-5.6%
54	Plymouth County	47.5	-4.4%
55	Jones County	47.4	-4.8%
55	Marshall County	47.4	-5%
57	Ida County	47.3	-4.8%
58	Linn County	47.2	-4.8%
58	Sac County	47.2	-5.4%
60	Calhoun County	46.9	-5.8%
60	Tama County	46.9	-5.3%
62	Benton County	46.7	-5.1%
63	Black Hawk County	46.6	-5.7%
64	Cherokee County	46.5	-4.9%
65	Dubuque County	46.4	-4.9%
65	Grundy County	46.4	-5.7%
65	Sioux County	46.4	-4.7%
65	Webster County	46.4	-6.1%
69	Hardin County	46.3	-6.1%
70	Hamilton County	46.2	-5.9%
71	Buena Vista County	46.1	-5.5%
72	O'Brien County	45.9	-5.2%
73	Clay County	45.8	-5.2%
74	Butler County	45.7	-6.4%
74	Humboldt County	45.7	-6.7%
76	Bremer County	45.6	-6.2%
76	Buchanan County	45.6	-5.8%
76	Delaware County	45.6	-5.6%
76	Pocahontas County	45.6	-6.4%
80	Lyon County	45.5	-5.6%
81	Franklin County	45.4	-6.6%
82	Wright County	45.3	-6.4%
83	Clayton County	45.2	-6.2%
83	Palo Alto County	45.2	-6.2%
85	Osceola County	45.1	-5.3%
86	Dickinson County	44.9	-5.7%
86	Floyd County	44.9	-6.8%
86	Kossuth County	44.9	-6.7%
89	Allamakee County	44.8	-6.5%
90	Cerro Gordo County	44.7	-6.9%
91	Chickasaw County	44.6	-6.5%
91	Emmet County	44.6	-5.9%
93	Fayette County	44.5	-6.5%
93	Hancock County	44.5	-7.1%
93	Winneshiek County	44.5	-6.9%
96	Mitchell County	44.2	-6.8%
96	Worth County	44.2	-6.6%
98	Winnebago County	43.9	-7.2%
99	Howard County	43.6	-6.6%

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 Iowa by average annual temperature, 2022) [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, 2022. 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=2022. 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, 2022. 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=2022.

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, 2022 [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=2022 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2022,
  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, 2022}},
  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=2022. 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, 2022
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=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2022.
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?

Fremont County, with 51.1 °F in 2022, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Howard County, with 43.6 °F in 2022.

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.