Cooling degree days in Pennsylvania was 788 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 8.9% from 2024. That is the 29th highest of 48 states in 2025.
Next release: Wednesday, 6 October 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar
Sum over January to December of the degrees by which the daily mean temperature exceeds 65°F, a measure of cooling demand. NOAA estimates monthly values from nClimDiv temperatures and weights areas by population (2010 Census).
NOAA publishes these for operational monitoring; they can differ from official degree day publications.
How to cite
NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. 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/statewide/time-series/36/cdd/12/12/1895-2025/data.json. 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 cooling degree days (base 65°F), contiguous US and statewide (Cooling degree days, Pennsylvania, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/cdd/12/12/1895-2025/data.json
MLA 9
NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide, Cooling degree days, Pennsylvania, 1895 to 2025. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-degree-days/pennsylvania. Accessed 12 Oct. 2026.
Chicago (author-date)
NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. Cooling degree days, Pennsylvania, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/pennsylvania.
Harvard
NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide, Cooling degree days, Pennsylvania, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/cdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/cooling-degree-days/pennsylvania (Accessed: 12 October 2026).
BibTeX
@misc{noaa_cooling_degree_days_pennsylvania_2025,
author = {{NOAA National Centers for Environmental Information}},
title = {{NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide: Cooling degree days, Pennsylvania, 1895 to 2025}},
year = {2026},
howpublished = {Data set},
url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/cdd/12/12/1895-2025/data.json},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/pennsylvania. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. 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/statewide/time-series/36/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.},
}
RIS
TY - DATA
AU - NOAA National Centers for Environmental Information
TI - NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide: Cooling degree days, Pennsylvania, 1895 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/statewide/time-series/36/cdd/12/12/1895-2025/data.json
L2 - https://invokely.ai/en/cooling-degree-days/pennsylvania
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/pennsylvania.
N1 - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. 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/statewide/time-series/36/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER -
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Cooling degree days in Pennsylvania was 788 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 8.9% from 2024. That is the 29th highest of 48 states in 2025.
Where does this figure come from?
NOAA National Centers for Environmental Information. NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. Retrieved by Invokely on 2026-10-12.
What was the highest cooling degree days in Pennsylvania?
914 degree days (base 65°F) in 2016, the highest value since 1895 in this series.