Counties in Iowa by average annual temperature

Lee County had the highest average annual temperature of 99 counties in 2018, at 51 °F. Worth County had the lowest, at 43.9 °F. The median was 47.7 °F and the figure for Iowa was 47.5 °F. Source: NOAA National Centers for Environmental Information.

Highest51Lee County

Lowest43.9Worth County

Median47.799 counties

Iowa47.5History

Map of counties, 2018

Under 45
45 to 47
47 to 48
48 to 49
49 to 50
50 and over

°F, 2018. 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, 2018

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

Full ranking

Rank	Counties	2018 °F	Change on 2017
1	Lee County	51	-4.1%
2	Decatur County	50.6	-4.3%
3	Des Moines County	50.5	-4.4%
4	Appanoose County	50.4	-4.2%
4	Davis County	50.4	-4%
4	Page County	50.4	-4.9%
4	Wapello County	50.4	-3.4%
8	Fremont County	50.3	-5.5%
9	Ringgold County	50.2	-4.4%
10	Monroe County	50.1	-4.2%
10	Taylor County	50.1	-4.6%
12	Mills County	50	-5.3%
12	Wayne County	50	-4.2%
14	Clarke County	49.8	-5%
15	Lucas County	49.7	-4.6%
15	Mahaska County	49.7	-4.1%
15	Van Buren County	49.7	-4.8%
18	Louisa County	49.6	-4.2%
18	Montgomery County	49.6	-5.2%
18	Scott County	49.6	-3.5%
18	Warren County	49.6	-5.5%
22	Marion County	49.4	-5%
23	Keokuk County	49.3	-4.1%
24	Polk County	49.2	-5.4%
24	Pottawattamie County	49.2	-5.6%
24	Union County	49.2	-5%
27	Adams County	49.1	-5%
27	Henry County	49.1	-5%
27	Jefferson County	49.1	-4.5%
27	Madison County	49.1	-5.6%
31	Clinton County	48.9	-3.9%
31	Dallas County	48.9	-5.4%
31	Washington County	48.9	-4.7%
34	Jasper County	48.8	-4.7%
34	Muscatine County	48.8	-3.9%
36	Iowa County	48.7	-4.1%
37	Cass County	48.6	-5.4%
37	Johnson County	48.6	-4.5%
39	Poweshiek County	48.5	-4%
40	Harrison County	48.4	-6%
41	Jackson County	48.3	-3.8%
42	Adair County	48.2	-5.7%
42	Cedar County	48.2	-4.2%
44	Boone County	48.1	-4.9%
44	Jones County	48.1	-4.2%
46	Story County	48	-5%
47	Guthrie County	47.9	-5.7%
48	Greene County	47.8	-5.5%
48	Shelby County	47.8	-5.7%
50	Marshall County	47.7	-5%
51	Monona County	47.6	-5.9%
52	Audubon County	47.4	-5.6%
52	Linn County	47.4	-4.2%
54	Carroll County	47.3	-5.6%
54	Crawford County	47.3	-5.4%
54	Tama County	47.3	-4.6%
57	Dubuque County	47.2	-3.7%
58	Calhoun County	46.9	-5.6%
58	Woodbury County	46.9	-5.8%
60	Benton County	46.8	-4.3%
61	Hardin County	46.7	-5.1%
62	Grundy County	46.6	-5.1%
62	Sac County	46.6	-5.7%
62	Webster County	46.6	-5.5%
65	Clayton County	46.5	-3.9%
65	Delaware County	46.5	-4.3%
65	Hamilton County	46.5	-5.1%
65	Ida County	46.5	-5.5%
69	Black Hawk County	46.3	-4.9%
70	Plymouth County	46.1	-6.1%
71	Butler County	46	-5.2%
72	Allamakee County	45.9	-4%
72	Bremer County	45.9	-5.2%
72	Franklin County	45.9	-5.2%
72	Pocahontas County	45.9	-5.9%
76	Buchanan County	45.8	-4.8%
76	Buena Vista County	45.8	-6%
76	Humboldt County	45.8	-5.8%
79	Cherokee County	45.7	-6%
80	Fayette County	45.6	-4.8%
80	Palo Alto County	45.6	-6%
82	Wright County	45.5	-5.4%
83	Floyd County	45.3	-5.2%
83	Sioux County	45.3	-6%
85	Cerro Gordo County	45.1	-5.3%
85	Clay County	45.1	-6.2%
87	Kossuth County	45	-5.9%
87	O'Brien County	45	-6.3%
89	Winneshiek County	44.9	-4.3%
90	Chickasaw County	44.8	-5.1%
90	Lyon County	44.8	-5.9%
92	Hancock County	44.7	-5.5%
93	Mitchell County	44.4	-5.9%
94	Dickinson County	44.2	-6%
94	Emmet County	44.2	-6.4%
96	Osceola County	44.1	-6.2%
97	Howard County	44	-5%
98	Winnebago County	43.9	-5.8%
98	Worth County	43.9	-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, 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 Iowa 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/iowa-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 Iowa 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/iowa-counties?period=2018.

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, 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/iowa-counties?period=2018 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2018,
  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, 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/iowa-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 Iowa 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/iowa-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-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  -

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Questions

Which county has the highest average annual temperature?

Lee County, with 51 °F in 2018, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Worth County, with 43.9 °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.