Average annual temperature in Island County

Average annual temperature in Island County was 52.4 °F in 2025, according to NOAA National Centers for Environmental Information. That is up 1% from 2024. That is the 8th highest of 39 counties in 2025.

2025, °F52.4

Change on 2024+1%

Rank8th of 39Counties in Washington ranked

Series high52.92015

Series low47.11955

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 Island 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	52.4
2024	51.9
2023	51.9
2022	50.8
2021	51
2020	51.4
2019	51.4
2018	52.1
2017	51.1
2016	52.6
2015	52.9
2014	52
2013	50.6
2012	50.2
2011	49.4
2010	51.2
2009	50.1
2008	49.4
2007	50.4
2006	51
2005	51.7
2004	52.3
2003	51.7
2002	50.5
2001	50.2
2000	50.1
1999	50
1998	51.9
1997	51.5
1996	49.7
1995	51.6
1994	51.3
1993	50.3
1992	52
1991	50.8
1990	50.4
1989	50.3
1988	50.6
1987	51.3
1986	50.7
1985	48.4
1984	49.9
1983	50.7
1982	49.4
1981	50.9
1980	50.1
1979	50.5
1978	50.3
1977	49.7
1976	49.5
1975	48.9
1974	50
1973	49.7
1972	48.7
1971	48.9
1970	49.5
1969	49.5
1968	50.1
1967	50.9
1966	50.1
1965	49.9
1964	48.5
1963	50.4
1962	49.7
1961	50.6
1960	49.4
1959	49.6
1958	52.3
1957	49.6
1956	48.9
1955	47.1
1954	48.9
1953	50.8
1952	49.5
1951	49.1
1950	48.3

Compared with Washington and United States

Place	2025
Island County	52.4
Washington	49.1
United States	54.6

Island County compared with nearby places

Under 47
47 to 49
49 to 50
50 to 52
52 to 53
53 and over

Average annual temperature, 2025, °F. Island 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 Washington by average annual temperature 39 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, Island 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, Island 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/island-county-washington. 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, Island 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/island-county-washington.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Average annual temperature, Island 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/island-county-washington (Accessed: 12 October 2026).

BibTeX

@misc{noaa_average_annual_temperature_island_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Average annual temperature, Island 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/island-county-washington. 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, Island 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/island-county-washington
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/average-annual-temperature/island-county-washington.
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 Island 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 Island County?

52.9 °F in 2015, the highest value since 1950 in this series.

Related statistics for Island County

All statistics for Island County | Island County in figures