Counties in Iowa by annual precipitation

Kossuth County had the highest annual precipitation of 99 counties in 2024, at 42.59 inches. Sac County had the lowest, at 28.55 inches. The median was 38 inches and the figure for Iowa was 37.05 inches. Source: NOAA National Centers for Environmental Information.

Highest42.59Kossuth County

Lowest28.55Sac County

Median3899 counties

Iowa37.05History

Map of counties, 2024

Under 34
34 to 36
36 to 38
38 to 39
39 to 40
40 and over

inches, 2024. Source: NOAA NCEI, NOAA Climate at a Glance, January to December precipitation, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

inches. Source: NOAA NCEI, NOAA Climate at a Glance, January to December precipitation, counties. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2024 inches	Change on 2023
1	Kossuth County	42.59	+52%
2	Jefferson County	41.72	+53.1%
3	Cedar County	41.7	+58.9%
4	Winnebago County	41.6	+51.5%
5	Delaware County	41.17	+49.1%
6	Keokuk County	40.88	+75.1%
7	Jackson County	40.49	+43.7%
8	Dubuque County	40.46	+44.4%
9	Worth County	40.4	+48.7%
10	Bremer County	40.33	+65.9%
11	Butler County	40.17	+69.4%
11	Mahaska County	40.17	+62.4%
13	Buchanan County	40.14	+60.6%
14	Appanoose County	40.06	+44.9%
15	Linn County	40.04	+63.9%
16	Wapello County	40	+68.6%
17	Jasper County	39.94	+44.8%
18	Warren County	39.93	+56.4%
19	Davis County	39.88	+47.5%
20	Jones County	39.84	+58.5%
21	Mitchell County	39.81	+41.7%
22	Clayton County	39.78	+52.1%
22	Poweshiek County	39.78	+55.3%
24	Black Hawk County	39.75	+72.9%
25	Marion County	39.56	+52.4%
26	Fayette County	39.52	+57.9%
27	Dickinson County	39.51	+36.3%
28	Van Buren County	39.38	+37.9%
29	Clay County	39.33	+25.8%
30	Des Moines County	39.3	+20.7%
31	Hancock County	39.29	+45.7%
32	Emmet County	39.2	+35.8%
33	Franklin County	39.17	+62.7%
34	Winneshiek County	39.06	+38.7%
35	O'Brien County	39.05	+25.1%
36	Lee County	39.04	+17.6%
37	Hardin County	38.9	+52.8%
38	Chickasaw County	38.89	+50.9%
39	Palo Alto County	38.86	+31.2%
40	Grundy County	38.84	+69.6%
41	Floyd County	38.76	+49.9%
42	Clinton County	38.66	+32.4%
43	Osceola County	38.61	+38.7%
44	Muscatine County	38.57	+41.2%
45	Allamakee County	38.53	+46.1%
46	Howard County	38.52	+40.2%
47	Henry County	38.36	+37.7%
48	Marshall County	38.2	+51.7%
49	Scott County	38.06	+26.6%
50	Madison County	38	+40.6%
51	Johnson County	37.95	+60.3%
52	Cerro Gordo County	37.86	+40.7%
53	Monroe County	37.63	+51.9%
54	Tama County	37.58	+63.5%
55	Washington County	37.55	+49.7%
56	Iowa County	37.54	+61.6%
57	Lyon County	37.51	+51.2%
58	Polk County	37.39	+34.5%
59	Louisa County	37.36	+35.8%
60	Story County	37.33	+23%
61	Humboldt County	37.14	+36.5%
62	Benton County	36.9	+68%
62	Wayne County	36.9	+37.2%
64	Lucas County	36.85	+51.1%
65	Clarke County	36.29	+38.6%
65	Wright County	36.29	+39.8%
67	Taylor County	36.21	+24.3%
68	Adair County	36.19	+25.9%
69	Sioux County	36.12	+27.7%
70	Union County	35.9	+27.9%
71	Dallas County	35.78	+29.3%
72	Decatur County	35.75	+24.7%
73	Hamilton County	35.68	+28.9%
74	Ringgold County	35.63	+22.8%
75	Adams County	35.33	+21%
76	Guthrie County	34.9	+28.4%
77	Audubon County	34.85	+33.7%
78	Cherokee County	34.73	+10.6%
79	Boone County	34.45	+17.5%
80	Cass County	34.01	+23%
81	Webster County	33.91	+21.8%
82	Page County	33.77	+27.8%
83	Shelby County	33.57	+30.6%
84	Montgomery County	33.34	+29%
85	Plymouth County	33.17	+10.6%
86	Greene County	32.88	+18.1%
87	Harrison County	32.85	+29.5%
88	Pocahontas County	32.68	+18.1%
89	Crawford County	32.4	+23.8%
90	Pottawattamie County	32.26	+26.4%
91	Carroll County	31.66	+22.9%
92	Ida County	30.57	+9.1%
93	Buena Vista County	30.5	+8.4%
94	Monona County	30.19	+14.3%
95	Woodbury County	30.1	+4.4%
96	Calhoun County	30.08	+14.9%
97	Mills County	29.66	+15.5%
98	Fremont County	28.77	+7.1%
99	Sac County	28.55	+10.7%

Other periods

About this ranking

Total precipitation from January to December, in inches: rain plus the water content of snow and other frozen precipitation. 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, not the reading at one weather station. 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 precipitation, 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 precipitation, counties (Counties in Iowa by annual precipitation, 2024) [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 precipitation, counties, Counties in Iowa by annual precipitation, 2024. 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/annual-precipitation/iowa-counties?period=2024. Accessed 12 Oct. 2026.

Chicago (author-date)

NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December precipitation, counties. Counties in Iowa by annual precipitation, 2024. 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/annual-precipitation/iowa-counties?period=2024.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December precipitation, counties, Counties in Iowa by annual precipitation, 2024 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/rankings/annual-precipitation/iowa-counties?period=2024 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_iowa_by_2024,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December precipitation, counties: Counties in Iowa by annual precipitation, 2024}},
  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/annual-precipitation/iowa-counties?period=2024. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December precipitation, 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 precipitation, counties: Counties in Iowa by annual precipitation, 2024
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/annual-precipitation/iowa-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/annual-precipitation/iowa-counties?period=2024.
N1  - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December precipitation, 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 annual precipitation?

Kossuth County, with 42.59 inches in 2024, according to NOAA National Centers for Environmental Information.

Which county has the lowest annual precipitation?

Sac County, with 28.55 inches in 2024.

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 precipitation, counties. Retrieved 2026-10-12.