Counties in Iowa by average annual temperature

Lee County had the highest average annual temperature of 99 counties in 2019, at 50.6 °F. Osceola County had the lowest, at 43.2 °F. The median was 47.1 °F and the figure for Iowa was 46.8 °F. Source: NOAA National Centers for Environmental Information.

Highest50.6Lee County

Lowest43.2Osceola County

Median47.199 counties

Iowa46.8History

Map of counties, 2019

Under 45
45 to 46
46 to 47
47 to 48
48 to 49
49 and over

°F, 2019. 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, 2019

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

Full ranking

Rank	Counties	2019 °F	Change on 2018
1	Lee County	50.6	-0.8%
2	Des Moines County	50.1	-0.8%
2	Fremont County	50.1	-0.4%
4	Davis County	50	-0.8%
4	Page County	50	-0.8%
6	Decatur County	49.8	-1.6%
7	Mills County	49.7	-0.6%
8	Appanoose County	49.6	-1.6%
8	Wapello County	49.6	-1.6%
10	Ringgold County	49.5	-1.4%
11	Taylor County	49.4	-1.4%
12	Monroe County	49.3	-1.6%
12	Van Buren County	49.3	-0.8%
14	Montgomery County	49.2	-0.8%
14	Wayne County	49.2	-1.6%
16	Louisa County	49.1	-1%
17	Clarke County	49	-1.6%
17	Lucas County	49	-1.4%
19	Mahaska County	48.9	-1.6%
19	Warren County	48.9	-1.4%
21	Henry County	48.8	-0.6%
21	Marion County	48.8	-1.2%
21	Pottawattamie County	48.8	-0.8%
24	Keokuk County	48.7	-1.2%
24	Scott County	48.7	-1.8%
26	Jefferson County	48.6	-1%
26	Washington County	48.6	-0.6%
28	Clinton County	48.5	-0.8%
29	Adams County	48.4	-1.4%
29	Union County	48.4	-1.6%
31	Muscatine County	48.3	-1%
31	Polk County	48.3	-1.8%
33	Madison County	48.2	-1.8%
34	Cass County	48.1	-1%
34	Harrison County	48.1	-0.6%
36	Dallas County	48	-1.8%
36	Jasper County	48	-1.6%
38	Cedar County	47.7	-1%
38	Iowa County	47.7	-2.1%
38	Jackson County	47.7	-1.2%
38	Johnson County	47.7	-1.9%
38	Poweshiek County	47.7	-1.6%
43	Adair County	47.6	-1.2%
44	Guthrie County	47.5	-0.8%
44	Jones County	47.5	-1.2%
46	Shelby County	47.4	-0.8%
47	Monona County	47.3	-0.6%
48	Boone County	47.2	-1.9%
49	Greene County	47.1	-1.5%
49	Story County	47.1	-1.9%
51	Audubon County	46.9	-1.1%
51	Carroll County	46.9	-0.8%
51	Crawford County	46.9	-0.8%
51	Marshall County	46.9	-1.7%
55	Woodbury County	46.6	-0.6%
56	Linn County	46.4	-2.1%
56	Tama County	46.4	-1.9%
58	Dubuque County	46.3	-1.9%
59	Calhoun County	46.1	-1.7%
59	Sac County	46.1	-1.1%
61	Grundy County	46	-1.3%
61	Hardin County	46	-1.5%
61	Ida County	46	-1.1%
64	Black Hawk County	45.8	-1.1%
64	Webster County	45.8	-1.7%
66	Benton County	45.7	-2.4%
66	Delaware County	45.7	-1.7%
66	Hamilton County	45.7	-1.7%
69	Plymouth County	45.6	-1.1%
70	Butler County	45.4	-1.3%
70	Clayton County	45.4	-2.4%
72	Bremer County	45.3	-1.3%
73	Franklin County	45.2	-1.5%
73	Humboldt County	45.2	-1.3%
75	Buena Vista County	45.1	-1.5%
75	Pocahontas County	45.1	-1.7%
77	Allamakee County	45	-2%
77	Buchanan County	45	-1.7%
79	Cherokee County	44.9	-1.8%
79	Wright County	44.9	-1.3%
81	Clay County	44.6	-1.1%
81	Palo Alto County	44.6	-2.2%
83	Floyd County	44.5	-1.8%
83	Sioux County	44.5	-1.8%
85	Cerro Gordo County	44.4	-1.6%
85	Fayette County	44.4	-2.6%
87	Hancock County	44.3	-0.9%
88	Chickasaw County	44.2	-1.3%
88	O'Brien County	44.2	-1.8%
90	Kossuth County	44.1	-2%
91	Lyon County	43.9	-2%
91	Winneshiek County	43.9	-2.2%
93	Mitchell County	43.6	-1.8%
94	Dickinson County	43.5	-1.6%
94	Winnebago County	43.5	-0.9%
96	Worth County	43.4	-1.1%
97	Emmet County	43.3	-2%
98	Howard County	43.2	-1.8%
98	Osceola County	43.2	-2%

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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2019.
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?

Lee County, with 50.6 °F in 2019, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Osceola County, with 43.2 °F in 2019.

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.