Counties in Iowa by average annual temperature

Fremont County had the highest average annual temperature of 99 counties in 2016, at 54.1 °F. Howard County had the lowest, at 47.1 °F. The median was 50.9 °F and the figure for Iowa was 50.7 °F. Source: NOAA National Centers for Environmental Information.

Highest54.1Fremont County

Lowest47.1Howard County

Median50.999 counties

Iowa50.7History

Map of counties, 2016

Under 49
49 to 50
50 to 51
51 to 52
52 to 53
53 and over

°F, 2016. 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, 2016

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

Full ranking

Rank	Counties	2016 °F	Change on 2015
1	Fremont County	54.1	+3%
2	Page County	53.7	+2.9%
3	Lee County	53.6	+3.5%
3	Mills County	53.6	+3.1%
5	Decatur County	53.2	+2.3%
5	Taylor County	53.2	+3.7%
7	Davis County	53.1	+2.3%
7	Des Moines County	53.1	+3.7%
7	Montgomery County	53.1	+3.1%
10	Appanoose County	53	+2.9%
10	Warren County	53	+3.5%
12	Ringgold County	52.9	+3.1%
12	Wapello County	52.9	+2.7%
14	Pottawattamie County	52.8	+3.1%
14	Van Buren County	52.8	+3.3%
16	Mahaska County	52.7	+2.9%
16	Monroe County	52.7	+2.7%
18	Clarke County	52.6	+2.7%
18	Louisa County	52.6	+4%
18	Wayne County	52.6	+2.7%
21	Adams County	52.5	+3.1%
21	Madison County	52.5	+3.1%
23	Lucas County	52.4	+2.5%
23	Marion County	52.4	+2.7%
23	Polk County	52.4	+4%
26	Dallas County	52.3	+4%
26	Harrison County	52.3	+2.5%
26	Keokuk County	52.3	+3.6%
26	Scott County	52.3	+4%
26	Union County	52.3	+3%
31	Henry County	52.2	+3.8%
32	Jefferson County	52.1	+3.4%
32	Washington County	52.1	+3.6%
34	Cass County	51.9	+3.2%
35	Clinton County	51.8	+4%
35	Jasper County	51.8	+3.2%
37	Iowa County	51.7	+4%
37	Muscatine County	51.7	+4.2%
39	Adair County	51.6	+2.6%
39	Johnson County	51.6	+4%
41	Monona County	51.4	+2.6%
42	Guthrie County	51.3	+3%
42	Poweshiek County	51.3	+3.4%
42	Shelby County	51.3	+2.6%
45	Boone County	51.2	+3.6%
46	Cedar County	51.1	+4.1%
46	Greene County	51.1	+3.7%
46	Story County	51.1	+3.4%
49	Jackson County	51	+3.9%
50	Marshall County	50.9	+3.2%
50	Woodbury County	50.9	+2.6%
52	Jones County	50.8	+4.1%
53	Audubon County	50.7	+2.8%
54	Crawford County	50.6	+2.6%
55	Carroll County	50.5	+3.1%
55	Linn County	50.5	+3.5%
57	Tama County	50.3	+3.1%
58	Calhoun County	50.2	+2.7%
59	Ida County	50	+2.9%
59	Plymouth County	50	+1.6%
59	Sac County	50	+2.9%
62	Benton County	49.9	+2.9%
63	Webster County	49.8	+2.7%
64	Dubuque County	49.7	+3.5%
64	Grundy County	49.7	+2.7%
64	Hardin County	49.7	+2.9%
67	Hamilton County	49.6	+3.1%
68	Black Hawk County	49.5	+2.5%
68	Buena Vista County	49.5	+2.5%
68	Cherokee County	49.5	+2.3%
68	Pocahontas County	49.5	+2.5%
72	Delaware County	49.3	+3.6%
72	Humboldt County	49.3	+2.7%
72	Palo Alto County	49.3	+2.1%
75	Bremer County	49.1	+2.7%
75	Butler County	49.1	+2.5%
75	Sioux County	49.1	+1.7%
78	Clay County	49	+1.9%
78	Clayton County	49	+3.6%
80	Buchanan County	48.9	+2.5%
80	Franklin County	48.9	+2.5%
82	O'Brien County	48.8	+1.9%
82	Wright County	48.8	+2.7%
84	Kossuth County	48.7	+2.3%
85	Allamakee County	48.6	+2.5%
85	Lyon County	48.6	+1.7%
87	Fayette County	48.5	+3%
87	Floyd County	48.5	+2.5%
89	Cerro Gordo County	48.4	+2.3%
90	Hancock County	48.3	+2.3%
91	Emmet County	48.2	+1.9%
92	Dickinson County	48.1	+1.9%
93	Chickasaw County	48	+2.8%
94	Osceola County	47.9	+2.1%
95	Mitchell County	47.8	+2.6%
96	Winnebago County	47.7	+2.1%
96	Winneshiek County	47.7	+2.1%
96	Worth County	47.7	+2.1%
99	Howard County	47.1	+2.4%

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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2016.
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 54.1 °F in 2016, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Howard County, with 47.1 °F in 2016.

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.