Average annual temperature in Delaware County

Average annual temperature in Delaware County was 55.1 °F in 2025, according to NOAA National Centers for Environmental Information. That is down 3.5% from 2024. That is the 2nd highest of 67 counties in 2025.

2025, °F55.1

Change on 2024-3.5%

Rank2nd of 67Counties in Pennsylvania ranked

Series high57.12012

Series low51.61958

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 Delaware 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	55.1
2024	57.1
2023	56.8
2022	55.8
2021	56.4
2020	56.5
2019	55.6
2018	55.6
2017	56.2
2016	56.5
2015	55.7
2014	53.5
2013	54.6
2012	57.1
2011	56.2
2010	56.1
2009	54.2
2008	55.1
2007	55.1
2006	56.5
2005	55.1
2004	54.5
2003	53.4
2002	55.9
2001	55.3
2000	53.5
1999	55.4
1998	56.7
1997	53.5
1996	52.5
1995	53.9
1994	53.6
1993	53.7
1992	52.6
1991	55.6
1990	55.7
1989	52.6
1988	53
1987	53.9
1986	53.6
1985	53.9
1984	53.3
1983	53.9
1982	52.8
1981	52.8
1980	53.3
1979	52.9
1978	51.8
1977	53.3
1976	52.7
1975	54.3
1974	53.5
1973	54.8
1972	52.4
1971	53.7
1970	52.9
1969	52.8
1968	53
1967	51.8
1966	52.6
1965	52.5
1964	53.3
1963	51.8
1962	51.8
1961	52.8
1960	52.5
1959	54.4
1958	51.6
1957	54.1
1956	52.9
1955	53.7
1954	53.8
1953	55
1952	54.1
1951	53.5
1950	52.5

Compared with Pennsylvania and United States

Place	2025
Delaware County	55.1
Pennsylvania	49.6
United States	54.6

Rankings

US states by average annual temperature 50 places
Counties in Pennsylvania by average annual temperature 67 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.

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, Delaware 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, Delaware 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/delaware-county-pennsylvania. 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, Delaware 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/delaware-county-pennsylvania.

Harvard

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

BibTeX

@misc{noaa_average_annual_temperature_delaware_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Average annual temperature, Delaware 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/delaware-county-pennsylvania. 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, Delaware 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/delaware-county-pennsylvania
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/average-annual-temperature/delaware-county-pennsylvania.
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 Delaware 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 Delaware County?

57.1 °F in 2012, the highest value since 1950 in this series.

Related statistics for Delaware County

All statistics for Delaware County | Delaware County in figures