Counties in Pennsylvania by average annual temperature

Philadelphia County had the highest average annual temperature of 67 counties in 2020, at 57.1 °F. Sullivan County had the lowest, at 47.5 °F. The median was 51.3 °F and the figure for Pennsylvania was 51.2 °F. Source: NOAA National Centers for Environmental Information.

Highest57.1Philadelphia County

Lowest47.5Sullivan County

Median51.367 counties

Pennsylvania51.2History

Map of counties, 2020

Under 49
49 to 50
50 to 51
51 to 53
53 to 54
54 and over

°F, 2020. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

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

Full ranking

Rank	Counties	2020 °F	Change on 2019
1	Philadelphia County	57.1	+1.1%
2	Delaware County	56.5	+1.6%
3	Montgomery County	55.8	+2.2%
4	Lancaster County	55.2	+3.2%
5	Chester County	55.1	+2%
6	Bucks County	55	+2%
6	York County	55	+2.2%
8	Adams County	54.4	+1.9%
8	Berks County	54.4	+2.4%
10	Cumberland County	54.3	+1.5%
11	Lebanon County	54.1	+2.7%
12	Franklin County	54	+1.7%
13	Fulton County	53.9	+2.5%
14	Dauphin County	53.8	+2.1%
14	Lehigh County	53.8	+1.7%
16	Perry County	53.4	+1.5%
17	Allegheny County	53.2	+1.7%
18	Greene County	53.1	+0.4%
19	Juniata County	52.9	+1.5%
19	Northampton County	52.9	+1.9%
19	Washington County	52.9	+1%
22	Bedford County	52.8	+2.7%
23	Huntingdon County	52.6	+2.3%
24	Beaver County	52.3	+1.9%
24	Mifflin County	52.3	+2.1%
24	Snyder County	52.3	+2.5%
24	Westmoreland County	52.3	+1.8%
28	Fayette County	52.1	+0.8%
28	Northumberland County	52.1	+2.8%
30	Montour County	51.9	+3%
31	Union County	51.6	+2.8%
32	Armstrong County	51.4	+1.8%
32	Schuylkill County	51.4	+2.4%
34	Lawrence County	51.3	+2.4%
35	Blair County	51.2	+2.6%
36	Butler County	51.1	+2.2%
37	Columbia County	50.9	+3%
38	Indiana County	50.7	+1.8%
39	Centre County	50.4	+3.3%
39	Mercer County	50.4	+2.4%
41	Clarion County	50.1	+1.8%
41	Erie County	50.1	+3.3%
43	Wyoming County	50	+4.8%
44	Carbon County	49.9	+2.9%
44	Luzerne County	49.9	+4.6%
44	Lycoming County	49.9	+3.3%
44	Venango County	49.9	+2%
48	Clinton County	49.8	+3.3%
48	Somerset County	49.8	+1.2%
50	Crawford County	49.7	+2.7%
50	Jefferson County	49.7	+3.1%
52	Lackawanna County	49.6	+5.1%
53	Clearfield County	49.5	+3.3%
54	Cambria County	49.3	+2.3%
54	Monroe County	49.3	+2.7%
56	Pike County	49.2	+3.4%
57	Forest County	49.1	+1.9%
58	Bradford County	49	+3.6%
59	Elk County	48.8	+2.5%
59	Susquehanna County	48.8	+4.5%
61	Warren County	48.6	+2.7%
61	Wayne County	48.6	+4.3%
63	Cameron County	48.5	+3.2%
64	Tioga County	48	+3.9%
65	McKean County	47.9	+3.2%
66	Potter County	47.5	+3.9%
66	Sullivan County	47.5	+3.7%

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, 2020) [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, 2020. 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?period=2020. 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, 2020. 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?period=2020.

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, 2020 [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?period=2020 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_pennsylvania_by_2020,
  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, 2020}},
  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?period=2020. 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, 2020
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?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/pennsylvania-counties?period=2020.
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 57.1 °F in 2020, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Sullivan County, with 47.5 °F in 2020.

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.