Counties in Pennsylvania by average annual temperature, 2025

Philadelphia County had the highest average annual temperature of 67 counties in 2025, at 55.4 °F. Sullivan County had the lowest, at 45.6 °F. The median was 49.8 °F and the figure for Pennsylvania was 49.6 °F. Source: NOAA National Centers for Environmental Information.

Highest55.4Philadelphia County

Lowest45.6Sullivan County

Median49.867 counties

Pennsylvania49.6History

Top 40 counties, 2025

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

Full ranking

Rank	Counties	2025 °F	Change on 2024
1	Philadelphia County	55.4	-3.8%
2	Delaware County	55.1	-3.5%
3	Montgomery County	53.9	-3.8%
4	Chester County	53.5	-3.1%
5	York County	53.4	-3.8%
6	Lancaster County	53.3	-3.4%
7	Adams County	53.1	-3.6%
8	Bucks County	53	-3.6%
9	Cumberland County	52.9	-4%
10	Franklin County	52.7	-3.8%
11	Berks County	52.4	-3.3%
11	Dauphin County	52.4	-3.9%
13	Fulton County	52.3	-3.9%
14	Lebanon County	52.2	-3.9%
15	Allegheny County	52.1	-6.1%
15	Lehigh County	52.1	-3.3%
15	Perry County	52.1	-4.1%
18	Greene County	51.7	-5.1%
19	Juniata County	51.6	-4.1%
20	Washington County	51.5	-6%
21	Bedford County	51.1	-4.3%
21	Huntingdon County	51.1	-4.7%
21	Northampton County	51.1	-3.9%
21	Snyder County	51.1	-3.8%
25	Beaver County	50.8	-5.6%
25	Mifflin County	50.8	-4.3%
25	Westmoreland County	50.8	-6.1%
28	Northumberland County	50.7	-3.8%
29	Montour County	50.5	-3.8%
30	Fayette County	50.4	-5.4%
30	Union County	50.4	-3.8%
32	Armstrong County	49.9	-5.1%
32	Schuylkill County	49.9	-3.7%
34	Blair County	49.8	-4.8%
35	Butler County	49.6	-5.7%
36	Lawrence County	49.5	-6.1%
37	Columbia County	49.4	-3.9%
38	Centre County	49.3	-4.1%
39	Indiana County	49.2	-5.2%
40	Clinton County	49	-3.5%
41	Carbon County	48.8	-3.6%
41	Mercer County	48.8	-6.2%
43	Lycoming County	48.7	-3.9%
44	Venango County	48.5	-5.3%
45	Clarion County	48.4	-5.5%
45	Clearfield County	48.4	-4.9%
45	Somerset County	48.4	-4.7%
48	Crawford County	48.2	-6%
49	Erie County	48.1	-6.4%
49	Jefferson County	48.1	-6.1%
51	Cambria County	48	-5.1%
51	Luzerne County	48	-4.8%
53	Monroe County	47.9	-4%
54	Cameron County	47.8	-4.6%
55	Elk County	47.6	-5.4%
55	Pike County	47.6	-4.2%
57	Forest County	47.5	-5.4%
58	Wyoming County	47.4	-5.8%
59	Bradford County	47.3	-4.4%
59	Lackawanna County	47.3	-5.2%
61	Susquehanna County	46.9	-4.9%
61	Warren County	46.9	-5.6%
63	Wayne County	46.8	-4.5%
64	Tioga County	46.6	-4.5%
65	McKean County	46.4	-6.5%
66	Potter County	46.3	-5.1%
67	Sullivan County	45.6	-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 Pennsylvania by average annual temperature, 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, Counties in Pennsylvania by average annual temperature, 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/rankings/average-annual-temperature/pennsylvania-counties. 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 Pennsylvania by average annual temperature, 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/rankings/average-annual-temperature/pennsylvania-counties.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Counties in Pennsylvania by average annual temperature, 2025 [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/pennsylvania-counties (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_pennsylvania_by_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Counties in Pennsylvania by average annual temperature, 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/rankings/average-annual-temperature/pennsylvania-counties. 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 Pennsylvania by average annual temperature, 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/rankings/average-annual-temperature/pennsylvania-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/pennsylvania-counties.
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?

Philadelphia County, with 55.4 °F in 2025, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Sullivan County, with 45.6 °F in 2025.

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.