Counties in Iowa by average annual temperature

Fremont County had the highest average annual temperature of 99 counties in 2014, at 49.6 °F. Howard County had the lowest, at 41.6 °F. The median was 45.7 °F and the figure for Iowa was 45.5 °F. Source: NOAA National Centers for Environmental Information.

Highest49.6Fremont County

Lowest41.6Howard County

Median45.799 counties

Iowa45.5History

Map of counties, 2014

Under 43
43 to 44
44 to 46
46 to 47
47 to 48
48 and over

°F, 2014. 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, 2014

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

Full ranking

Rank	Counties	2014 °F	Change on 2013
1	Fremont County	49.6	-1%
2	Page County	49.2	-1%
3	Mills County	49.1	-0.8%
4	Montgomery County	48.5	-0.8%
5	Decatur County	48.3	-1.8%
6	Pottawattamie County	48.2	-0.6%
7	Taylor County	48.1	-1.6%
8	Harrison County	48	-0.2%
8	Ringgold County	48	-1.6%
10	Davis County	47.9	-3.6%
10	Lee County	47.9	-4.6%
12	Appanoose County	47.8	-3.4%
13	Adams County	47.7	-1.6%
13	Clarke County	47.7	-1.6%
13	Warren County	47.7	-2.1%
13	Wayne County	47.7	-2.5%
17	Union County	47.5	-1.7%
17	Wapello County	47.5	-3.7%
19	Des Moines County	47.4	-4.2%
19	Lucas County	47.4	-2.3%
19	Madison County	47.4	-1.3%
19	Monroe County	47.4	-3.3%
23	Marion County	47.2	-2.9%
24	Mahaska County	47.1	-3.3%
24	Van Buren County	47.1	-4.3%
26	Monona County	47	-0.4%
26	Polk County	47	-2.7%
28	Cass County	46.9	-1.7%
29	Adair County	46.8	-1.7%
29	Louisa County	46.8	-4.3%
31	Dallas County	46.7	-2.5%
32	Henry County	46.6	-4.5%
32	Scott County	46.6	-3.7%
32	Shelby County	46.6	-0.6%
35	Jefferson County	46.5	-4.9%
35	Keokuk County	46.5	-3.7%
35	Washington County	46.5	-4.3%
35	Woodbury County	46.5	0%
39	Jasper County	46.4	-2.7%
40	Guthrie County	46.2	-1.9%
41	Clinton County	45.9	-3.8%
41	Crawford County	45.9	-0.9%
41	Muscatine County	45.9	-4.8%
44	Audubon County	45.8	-1.7%
44	Boone County	45.8	-2.3%
44	Greene County	45.8	-1.9%
47	Johnson County	45.7	-4.8%
47	Plymouth County	45.7	-0.9%
47	Poweshiek County	45.7	-3.2%
47	Story County	45.7	-2.6%
51	Carroll County	45.6	-1.5%
51	Iowa County	45.6	-4%
53	Marshall County	45.4	-2.6%
54	Cedar County	45.3	-4.6%
54	Ida County	45.3	-0.9%
56	Calhoun County	45.2	-1.7%
57	Jackson County	45.1	-3.6%
57	Sac County	45.1	-1.5%
59	Linn County	44.9	-4.1%
60	Cherokee County	44.8	-1.3%
60	Jones County	44.8	-3.9%
62	Tama County	44.7	-3.5%
62	Webster County	44.7	-2.2%
64	Sioux County	44.6	-1.3%
65	Buena Vista County	44.5	-1.1%
65	Pocahontas County	44.5	-1.1%
67	Benton County	44.3	-5.3%
67	Grundy County	44.3	-2.6%
67	Hamilton County	44.3	-2.9%
70	Hardin County	44.1	-2.9%
70	Humboldt County	44.1	-2.2%
72	Black Hawk County	43.9	-3.7%
72	Dubuque County	43.9	-3.7%
72	Lyon County	43.9	-1.1%
72	O'Brien County	43.9	-1.6%
72	Palo Alto County	43.9	-1.8%
77	Clay County	43.8	-2.2%
78	Butler County	43.7	-3.1%
79	Delaware County	43.6	-3.8%
80	Buchanan County	43.5	-4.4%
80	Franklin County	43.5	-2.7%
82	Kossuth County	43.4	-2.3%
82	Wright County	43.4	-3.3%
84	Clayton County	43.3	-3.6%
85	Allamakee County	43	-3.4%
85	Bremer County	43	-4%
85	Dickinson County	43	-2.3%
85	Emmet County	43	-2.5%
89	Cerro Gordo County	42.9	-2.9%
89	Hancock County	42.9	-2.9%
91	Floyd County	42.8	-3.6%
91	Osceola County	42.8	-1.8%
93	Fayette County	42.7	-3.8%
94	Winnebago County	42.4	-3%
95	Worth County	42.2	-3.4%
96	Chickasaw County	42.1	-4.1%
96	Mitchell County	42.1	-3.4%
96	Winneshiek County	42.1	-3.9%
99	Howard County	41.6	-3.5%

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, 2014) [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, 2014. 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=2014. 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, 2014. 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=2014.

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, 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2014,
  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, 2014}},
  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=2014. 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, 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/iowa-counties?period=2014.
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 49.6 °F in 2014, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Howard County, with 41.6 °F in 2014.

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.