Data / Heating degree days / Pennsylvania

Heating degree days in Pennsylvania

Heating degree days in Pennsylvania was 5,721 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 14.7% from 2024. That is the 21st highest of 48 states in 2025.

2025, degree days (base 65°F)5,721
Change on 2024+14.7%
Rank21st of 48US states ranked
Series high7,1091904
Series low4,9301998

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Heating degree days in Pennsylvania, 1895 to 2025

4,5005,0005,5006,0006,5007,0007,500189519141933195219711990200920251895: 6,671 degree days (base 65°F)1896: 6,202 degree days (base 65°F)1897: 6,137 degree days (base 65°F)1898: 5,929 degree days (base 65°F)1899: 6,301 degree days (base 65°F)1900: 6,033 degree days (base 65°F)1901: 6,644 degree days (base 65°F)1902: 6,225 degree days (base 65°F)1903: 6,225 degree days (base 65°F)1904: 7,109 degree days (base 65°F)1905: 6,509 degree days (base 65°F)1906: 6,101 degree days (base 65°F)1907: 6,757 degree days (base 65°F)1908: 6,086 degree days (base 65°F)1909: 6,206 degree days (base 65°F)1910: 6,328 degree days (base 65°F)1911: 6,032 degree days (base 65°F)1912: 6,488 degree days (base 65°F)1913: 5,556 degree days (base 65°F)1914: 6,556 degree days (base 65°F)1915: 6,154 degree days (base 65°F)1916: 6,448 degree days (base 65°F)1917: 7,101 degree days (base 65°F)1918: 6,207 degree days (base 65°F)1919: 5,865 degree days (base 65°F)1920: 6,453 degree days (base 65°F)1921: 5,450 degree days (base 65°F)1922: 5,936 degree days (base 65°F)1923: 6,182 degree days (base 65°F)1924: 6,668 degree days (base 65°F)1925: 6,329 degree days (base 65°F)1926: 6,796 degree days (base 65°F)1927: 5,925 degree days (base 65°F)1928: 6,217 degree days (base 65°F)1929: 6,101 degree days (base 65°F)1930: 6,048 degree days (base 65°F)1931: 5,551 degree days (base 65°F)1932: 5,814 degree days (base 65°F)1933: 5,914 degree days (base 65°F)1934: 6,398 degree days (base 65°F)1935: 6,384 degree days (base 65°F)1936: 6,361 degree days (base 65°F)1937: 6,176 degree days (base 65°F)1938: 5,797 degree days (base 65°F)1939: 5,956 degree days (base 65°F)1940: 6,859 degree days (base 65°F)1941: 5,935 degree days (base 65°F)1942: 6,098 degree days (base 65°F)1943: 6,477 degree days (base 65°F)1944: 6,235 degree days (base 65°F)1945: 6,125 degree days (base 65°F)1946: 5,570 degree days (base 65°F)1947: 6,196 degree days (base 65°F)1948: 6,158 degree days (base 65°F)1949: 5,518 degree days (base 65°F)1950: 6,225 degree days (base 65°F)1951: 6,011 degree days (base 65°F)1952: 5,906 degree days (base 65°F)1953: 5,494 degree days (base 65°F)1954: 5,873 degree days (base 65°F)1955: 6,117 degree days (base 65°F)1956: 6,117 degree days (base 65°F)1957: 5,917 degree days (base 65°F)1958: 6,694 degree days (base 65°F)1959: 5,877 degree days (base 65°F)1960: 6,402 degree days (base 65°F)1961: 6,294 degree days (base 65°F)1962: 6,501 degree days (base 65°F)1963: 6,556 degree days (base 65°F)1964: 6,107 degree days (base 65°F)1965: 6,251 degree days (base 65°F)1966: 6,450 degree days (base 65°F)1967: 6,457 degree days (base 65°F)1968: 6,323 degree days (base 65°F)1969: 6,332 degree days (base 65°F)1970: 6,241 degree days (base 65°F)1971: 6,081 degree days (base 65°F)1972: 6,359 degree days (base 65°F)1973: 5,652 degree days (base 65°F)1974: 5,945 degree days (base 65°F)1975: 5,856 degree days (base 65°F)1976: 6,425 degree days (base 65°F)1977: 6,216 degree days (base 65°F)1978: 6,654 degree days (base 65°F)1979: 6,201 degree days (base 65°F)1980: 6,411 degree days (base 65°F)1981: 6,310 degree days (base 65°F)1982: 6,080 degree days (base 65°F)1983: 6,021 degree days (base 65°F)1984: 6,029 degree days (base 65°F)1985: 5,851 degree days (base 65°F)1986: 5,883 degree days (base 65°F)1987: 5,878 degree days (base 65°F)1988: 6,298 degree days (base 65°F)1989: 6,323 degree days (base 65°F)1990: 5,151 degree days (base 65°F)1991: 5,392 degree days (base 65°F)1992: 6,124 degree days (base 65°F)1993: 6,115 degree days (base 65°F)1994: 6,165 degree days (base 65°F)1995: 6,094 degree days (base 65°F)1996: 6,263 degree days (base 65°F)1997: 6,032 degree days (base 65°F)1998: 4,930 degree days (base 65°F)1999: 5,577 degree days (base 65°F)2000: 5,909 degree days (base 65°F)2001: 5,508 degree days (base 65°F)2002: 5,531 degree days (base 65°F)2003: 6,150 degree days (base 65°F)2004: 5,759 degree days (base 65°F)2005: 5,873 degree days (base 65°F)2006: 5,190 degree days (base 65°F)2007: 5,661 degree days (base 65°F)2008: 5,800 degree days (base 65°F)2009: 5,864 degree days (base 65°F)2010: 5,625 degree days (base 65°F)2011: 5,458 degree days (base 65°F)2012: 5,011 degree days (base 65°F)2013: 5,832 degree days (base 65°F)2014: 6,290 degree days (base 65°F)2015: 5,705 degree days (base 65°F)2016: 5,375 degree days (base 65°F)2017: 5,253 degree days (base 65°F)2018: 5,760 degree days (base 65°F)2019: 5,590 degree days (base 65°F)2020: 5,186 degree days (base 65°F)2021: 5,231 degree days (base 65°F)2022: 5,707 degree days (base 65°F)2023: 4,952 degree days (base 65°F)2024: 4,988 degree days (base 65°F)2025: 5,721 degree days (base 65°F)
degree days (base 65°F). Source: NOAA NCEI, NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide. Retrieved 2026-10-12, published 2026-10-06.
All 131 values
Perioddegree days (base 65°F)
20255,721
20244,988
20234,952
20225,707
20215,231
20205,186
20195,590
20185,760
20175,253
20165,375
20155,705
20146,290
20135,832
20125,011
20115,458
20105,625
20095,864
20085,800
20075,661
20065,190
20055,873
20045,759
20036,150
20025,531
20015,508
20005,909
19995,577
19984,930
19976,032
19966,263
19956,094
19946,165
19936,115
19926,124
19915,392
19905,151
19896,323
19886,298
19875,878
19865,883
19855,851
19846,029
19836,021
19826,080
19816,310
19806,411
19796,201
19786,654
19776,216
19766,425
19755,856
19745,945
19735,652
19726,359
19716,081
19706,241
19696,332
19686,323
19676,457
19666,450
19656,251
19646,107
19636,556
19626,501
19616,294
19606,402
19595,877
19586,694
19575,917
19566,117
19556,117
19545,873
19535,494
19525,906
19516,011
19506,225
19495,518
19486,158
19476,196
19465,570
19456,125
19446,235
19436,477
19426,098
19415,935
19406,859
19395,956
19385,797
19376,176
19366,361
19356,384
19346,398
19335,914
19325,814
19315,551
19306,048
19296,101
19286,217
19275,925
19266,796
19256,329
19246,668
19236,182
19225,936
19215,450
19206,453
19195,865
19186,207
19177,101
19166,448
19156,154
19146,556
19135,556
19126,488
19116,032
19106,328
19096,206
19086,086
19076,757
19066,101
19056,509
19047,109
19036,225
19026,225
19016,644
19006,033
18996,301
18985,929
18976,137
18966,202
18956,671

Compared with United States

Place2025
Pennsylvania5,721
United States4,062

Rankings

Definition

Sum over January to December of the degrees by which the daily mean temperature falls below 65°F, a measure of heating 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 heating 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/hdd/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 heating degree days (base 65°F), contiguous US and statewide (Heating 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/hdd/12/12/1895-2025/data.json

MLA 9

NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide, Heating 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/hdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/heating-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 heating degree days (base 65°F), contiguous US and statewide. Heating 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/hdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/heating-degree-days/pennsylvania.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide, Heating degree days, Pennsylvania, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/36/hdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/heating-degree-days/pennsylvania (Accessed: 12 October 2026).

BibTeX
@misc{noaa_heating_degree_days_pennsylvania_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide: Heating 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/hdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/heating-degree-days/pennsylvania. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December heating 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/hdd/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 heating degree days (base 65°F), contiguous US and statewide: Heating 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/hdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/heating-degree-days/pennsylvania
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/heating-degree-days/pennsylvania.
N1  - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December heating 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/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the heating degree days in Pennsylvania?

Heating degree days in Pennsylvania was 5,721 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 14.7% from 2024. That is the 21st 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 heating degree days (base 65°F), contiguous US and statewide. Retrieved by Invokely on 2026-10-12.

What was the highest heating degree days in Pennsylvania?

7,109 degree days (base 65°F) in 1904, the highest value since 1895 in this series.

Heating degree days elsewhere in United States

Related statistics for Pennsylvania

All statistics for Pennsylvania | Pennsylvania in figures