Average annual temperature in O'Brien County

Average annual temperature in O'Brien County was 48.2 °F in 2025, according to NOAA National Centers for Environmental Information. That is down 3% from 2024. That is the 76th highest of 99 counties in 2025.

2025, °F48.2

Change on 2024-3%

Rank76th of 99Counties in Iowa ranked

Series high50.22012

Series low41.91951

Next release: Wednesday, 6 October 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Average annual temperature in O'Brien County, 1950 to 2025

°F. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Retrieved 2026-10-12, published 2026-10-06.

All 76 values

Period	°F
2025	48.2
2024	49.7
2023	48.1
2022	45.9
2021	48.4
2020	47.4
2019	44.2
2018	45
2017	48
2016	48.8
2015	47.9
2014	43.9
2013	44.6
2012	50.2
2011	46.1
2010	46
2009	44.5
2008	43.7
2007	46.8
2006	48.4
2005	47.8
2004	46.4
2003	45.7
2002	46.9
2001	46.7
2000	46.2
1999	47.7
1998	48.7
1997	44.8
1996	42.4
1995	45
1994	45.1
1993	42.8
1992	45.8
1991	46.6
1990	47.4
1989	45
1988	46.6
1987	49.7
1986	46.7
1985	43.9
1984	45.5
1983	45
1982	44.1
1981	47.7
1980	46.5
1979	42.6
1978	43.2
1977	46.5
1976	46
1975	44.8
1974	46.1
1973	46.9
1972	43
1971	45.3
1970	44.4
1969	43.6
1968	45.9
1967	45
1966	44.5
1965	44.3
1964	46.5
1963	46.6
1962	44.6
1961	44.5
1960	44.2
1959	45
1958	46
1957	45.6
1956	45.8
1955	45.9
1954	46.8
1953	46.6
1952	45.6
1951	41.9
1950	42.5

Compared with Iowa and United States

Place	2025
O'Brien County	48.2
Iowa	49.7
United States	54.6

O'Brien County compared with nearby places

Under 48
48 to 49
49 to 50
50 to 51
51 to 52
52 and over

Average annual temperature, 2025, °F. O'Brien County is outlined. Same source and period for every area shown. Source: NOAA National Centers for Environmental Information. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

US states by average annual temperature 50 places
Counties in Iowa by average annual temperature 99 places

Definition

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.

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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 (Average annual temperature, O'Brien County, 1950 to 2025) [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, Average annual temperature, O'Brien County, 1950 to 2025. 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/en/average-annual-temperature/obrien-county-iowa. 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. Average annual temperature, O'Brien County, 1950 to 2025. 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/en/average-annual-temperature/obrien-county-iowa.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Average annual temperature, O'Brien County, 1950 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/en/average-annual-temperature/obrien-county-iowa (Accessed: 12 October 2026).

BibTeX

@misc{noaa_average_annual_temperature_o_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Average annual temperature, O'Brien County, 1950 to 2025}},
  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/en/average-annual-temperature/obrien-county-iowa. 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: Average annual temperature, O'Brien County, 1950 to 2025
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/en/average-annual-temperature/obrien-county-iowa
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/average-annual-temperature/obrien-county-iowa.
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

What is the average annual temperature in O'Brien County?

Where does this figure come from?

NOAA National Centers for Environmental Information. NOAA Climate at a Glance, January to December average temperature, counties. Retrieved by Invokely on 2026-10-12.

What was the highest average annual temperature in O'Brien County?

50.2 °F in 2012, the highest value since 1950 in this series.

Related statistics for O'Brien County

All statistics for O'Brien County | O'Brien County in figures