Counties in Iowa by average annual temperature

Fremont County had the highest average annual temperature of 99 counties in 2015, at 52.5 °F. Howard County had the lowest, at 46 °F. The median was 49.3 °F and the figure for Iowa was 49.3 °F. Source: NOAA National Centers for Environmental Information.

Highest52.5Fremont County

Lowest46Howard County

Median49.399 counties

Iowa49.3History

Map of counties, 2015

Under 48
48 to 49
49 to 50
50 to 51
51 and over

°F, 2015. 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, 2015

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

Full ranking

Rank	Counties	2015 °F	Change on 2014
1	Fremont County	52.5	+5.8%
2	Page County	52.2	+6.1%
3	Decatur County	52	+7.7%
3	Mills County	52	+5.9%
5	Davis County	51.9	+8.4%
6	Lee County	51.8	+8.1%
7	Appanoose County	51.5	+7.7%
7	Montgomery County	51.5	+6.2%
7	Wapello County	51.5	+8.4%
10	Monroe County	51.3	+8.2%
10	Ringgold County	51.3	+6.9%
10	Taylor County	51.3	+6.7%
13	Clarke County	51.2	+7.3%
13	Des Moines County	51.2	+8%
13	Mahaska County	51.2	+8.7%
13	Pottawattamie County	51.2	+6.2%
13	Warren County	51.2	+7.3%
13	Wayne County	51.2	+7.3%
19	Lucas County	51.1	+7.8%
19	Van Buren County	51.1	+8.5%
21	Harrison County	51	+6.3%
21	Marion County	51	+8.1%
23	Adams County	50.9	+6.7%
23	Madison County	50.9	+7.4%
25	Union County	50.8	+6.9%
26	Louisa County	50.6	+8.1%
27	Keokuk County	50.5	+8.6%
28	Jefferson County	50.4	+8.4%
28	Polk County	50.4	+7.2%
30	Adair County	50.3	+7.5%
30	Cass County	50.3	+7.2%
30	Dallas County	50.3	+7.7%
30	Henry County	50.3	+7.9%
30	Scott County	50.3	+7.9%
30	Washington County	50.3	+8.2%
36	Jasper County	50.2	+8.2%
37	Monona County	50.1	+6.6%
38	Shelby County	50	+7.3%
39	Clinton County	49.8	+8.5%
39	Guthrie County	49.8	+7.8%
41	Iowa County	49.7	+9%
42	Johnson County	49.6	+8.5%
42	Muscatine County	49.6	+8.1%
42	Poweshiek County	49.6	+8.5%
42	Woodbury County	49.6	+6.7%
46	Boone County	49.4	+7.9%
46	Story County	49.4	+8.1%
48	Audubon County	49.3	+7.6%
48	Crawford County	49.3	+7.4%
48	Greene County	49.3	+7.6%
48	Marshall County	49.3	+8.6%
52	Plymouth County	49.2	+7.7%
53	Cedar County	49.1	+8.4%
53	Jackson County	49.1	+8.9%
55	Carroll County	49	+7.5%
56	Calhoun County	48.9	+8.2%
57	Jones County	48.8	+8.9%
57	Linn County	48.8	+8.7%
57	Tama County	48.8	+9.2%
60	Ida County	48.6	+7.3%
60	Sac County	48.6	+7.8%
62	Benton County	48.5	+9.5%
62	Webster County	48.5	+8.5%
64	Cherokee County	48.4	+8%
64	Grundy County	48.4	+9.3%
66	Black Hawk County	48.3	+10%
66	Buena Vista County	48.3	+8.5%
66	Hardin County	48.3	+9.5%
66	Palo Alto County	48.3	+10%
66	Pocahontas County	48.3	+8.5%
66	Sioux County	48.3	+8.3%
72	Clay County	48.1	+9.8%
72	Hamilton County	48.1	+8.6%
74	Dubuque County	48	+9.3%
74	Humboldt County	48	+8.8%
76	Butler County	47.9	+9.6%
76	O'Brien County	47.9	+9.1%
78	Bremer County	47.8	+11.2%
78	Lyon County	47.8	+8.9%
80	Buchanan County	47.7	+9.7%
80	Franklin County	47.7	+9.7%
82	Delaware County	47.6	+9.2%
82	Kossuth County	47.6	+9.7%
84	Wright County	47.5	+9.4%
85	Allamakee County	47.4	+10.2%
86	Cerro Gordo County	47.3	+10.3%
86	Clayton County	47.3	+9.2%
86	Emmet County	47.3	+10%
86	Floyd County	47.3	+10.5%
90	Dickinson County	47.2	+9.8%
90	Hancock County	47.2	+10%
92	Fayette County	47.1	+10.3%
93	Osceola County	46.9	+9.6%
94	Chickasaw County	46.7	+10.9%
94	Winnebago County	46.7	+10.1%
94	Winneshiek County	46.7	+10.9%
94	Worth County	46.7	+10.7%
98	Mitchell County	46.6	+10.7%
99	Howard County	46	+10.6%

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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2015.
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 52.5 °F in 2015, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Howard County, with 46 °F in 2015.

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.