Data / Heating degree days / Delaware

Heating degree days in Delaware

Heating degree days in Delaware was 4,547 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 12.6% from 2024. That is the 30th highest of 48 states in 2025.

2025, degree days (base 65°F)4,547
Change on 2024+12.6%
Rank30th of 48US states ranked
Series high6,0301904
Series low3,8432023

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Heating degree days in Delaware, 1895 to 2025

3,5004,0004,5005,0005,5006,0006,500189519141933195219711990200920251895: 5,517 degree days (base 65°F)1896: 5,124 degree days (base 65°F)1897: 5,051 degree days (base 65°F)1898: 4,924 degree days (base 65°F)1899: 5,277 degree days (base 65°F)1900: 4,938 degree days (base 65°F)1901: 5,585 degree days (base 65°F)1902: 5,115 degree days (base 65°F)1903: 5,132 degree days (base 65°F)1904: 6,030 degree days (base 65°F)1905: 5,381 degree days (base 65°F)1906: 4,973 degree days (base 65°F)1907: 5,550 degree days (base 65°F)1908: 4,941 degree days (base 65°F)1909: 5,041 degree days (base 65°F)1910: 5,165 degree days (base 65°F)1911: 4,973 degree days (base 65°F)1912: 5,308 degree days (base 65°F)1913: 4,362 degree days (base 65°F)1914: 5,351 degree days (base 65°F)1915: 5,011 degree days (base 65°F)1916: 5,287 degree days (base 65°F)1917: 5,858 degree days (base 65°F)1918: 5,155 degree days (base 65°F)1919: 4,803 degree days (base 65°F)1920: 5,306 degree days (base 65°F)1921: 4,374 degree days (base 65°F)1922: 4,904 degree days (base 65°F)1923: 4,977 degree days (base 65°F)1924: 5,390 degree days (base 65°F)1925: 5,050 degree days (base 65°F)1926: 5,558 degree days (base 65°F)1927: 4,775 degree days (base 65°F)1928: 5,136 degree days (base 65°F)1929: 4,828 degree days (base 65°F)1930: 4,986 degree days (base 65°F)1931: 4,552 degree days (base 65°F)1932: 4,666 degree days (base 65°F)1933: 4,840 degree days (base 65°F)1934: 5,384 degree days (base 65°F)1935: 5,248 degree days (base 65°F)1936: 5,175 degree days (base 65°F)1937: 4,990 degree days (base 65°F)1938: 4,653 degree days (base 65°F)1939: 4,815 degree days (base 65°F)1940: 5,710 degree days (base 65°F)1941: 4,810 degree days (base 65°F)1942: 4,938 degree days (base 65°F)1943: 5,169 degree days (base 65°F)1944: 5,108 degree days (base 65°F)1945: 4,898 degree days (base 65°F)1946: 4,389 degree days (base 65°F)1947: 5,059 degree days (base 65°F)1948: 5,043 degree days (base 65°F)1949: 4,350 degree days (base 65°F)1950: 4,891 degree days (base 65°F)1951: 4,780 degree days (base 65°F)1952: 4,802 degree days (base 65°F)1953: 4,400 degree days (base 65°F)1954: 4,680 degree days (base 65°F)1955: 5,001 degree days (base 65°F)1956: 4,863 degree days (base 65°F)1957: 4,763 degree days (base 65°F)1958: 5,510 degree days (base 65°F)1959: 4,653 degree days (base 65°F)1960: 5,209 degree days (base 65°F)1961: 5,170 degree days (base 65°F)1962: 5,294 degree days (base 65°F)1963: 5,267 degree days (base 65°F)1964: 4,916 degree days (base 65°F)1965: 5,152 degree days (base 65°F)1966: 5,273 degree days (base 65°F)1967: 5,349 degree days (base 65°F)1968: 5,115 degree days (base 65°F)1969: 5,232 degree days (base 65°F)1970: 5,149 degree days (base 65°F)1971: 4,850 degree days (base 65°F)1972: 5,060 degree days (base 65°F)1973: 4,575 degree days (base 65°F)1974: 4,693 degree days (base 65°F)1975: 4,614 degree days (base 65°F)1976: 5,077 degree days (base 65°F)1977: 4,942 degree days (base 65°F)1978: 5,422 degree days (base 65°F)1979: 4,990 degree days (base 65°F)1980: 5,176 degree days (base 65°F)1981: 5,146 degree days (base 65°F)1982: 4,918 degree days (base 65°F)1983: 4,832 degree days (base 65°F)1984: 4,849 degree days (base 65°F)1985: 4,559 degree days (base 65°F)1986: 4,750 degree days (base 65°F)1987: 4,901 degree days (base 65°F)1988: 5,171 degree days (base 65°F)1989: 5,091 degree days (base 65°F)1990: 3,944 degree days (base 65°F)1991: 4,227 degree days (base 65°F)1992: 4,876 degree days (base 65°F)1993: 4,894 degree days (base 65°F)1994: 4,801 degree days (base 65°F)1995: 4,808 degree days (base 65°F)1996: 5,006 degree days (base 65°F)1997: 4,708 degree days (base 65°F)1998: 3,958 degree days (base 65°F)1999: 4,373 degree days (base 65°F)2000: 4,735 degree days (base 65°F)2001: 4,349 degree days (base 65°F)2002: 4,246 degree days (base 65°F)2003: 4,940 degree days (base 65°F)2004: 4,589 degree days (base 65°F)2005: 4,746 degree days (base 65°F)2006: 4,006 degree days (base 65°F)2007: 4,477 degree days (base 65°F)2008: 4,407 degree days (base 65°F)2009: 4,608 degree days (base 65°F)2010: 4,584 degree days (base 65°F)2011: 4,252 degree days (base 65°F)2012: 3,850 degree days (base 65°F)2013: 4,578 degree days (base 65°F)2014: 4,911 degree days (base 65°F)2015: 4,480 degree days (base 65°F)2016: 4,236 degree days (base 65°F)2017: 4,034 degree days (base 65°F)2018: 4,472 degree days (base 65°F)2019: 4,347 degree days (base 65°F)2020: 3,999 degree days (base 65°F)2021: 4,164 degree days (base 65°F)2022: 4,481 degree days (base 65°F)2023: 3,843 degree days (base 65°F)2024: 4,037 degree days (base 65°F)2025: 4,547 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)
20254,547
20244,037
20233,843
20224,481
20214,164
20203,999
20194,347
20184,472
20174,034
20164,236
20154,480
20144,911
20134,578
20123,850
20114,252
20104,584
20094,608
20084,407
20074,477
20064,006
20054,746
20044,589
20034,940
20024,246
20014,349
20004,735
19994,373
19983,958
19974,708
19965,006
19954,808
19944,801
19934,894
19924,876
19914,227
19903,944
19895,091
19885,171
19874,901
19864,750
19854,559
19844,849
19834,832
19824,918
19815,146
19805,176
19794,990
19785,422
19774,942
19765,077
19754,614
19744,693
19734,575
19725,060
19714,850
19705,149
19695,232
19685,115
19675,349
19665,273
19655,152
19644,916
19635,267
19625,294
19615,170
19605,209
19594,653
19585,510
19574,763
19564,863
19555,001
19544,680
19534,400
19524,802
19514,780
19504,891
19494,350
19485,043
19475,059
19464,389
19454,898
19445,108
19435,169
19424,938
19414,810
19405,710
19394,815
19384,653
19374,990
19365,175
19355,248
19345,384
19334,840
19324,666
19314,552
19304,986
19294,828
19285,136
19274,775
19265,558
19255,050
19245,390
19234,977
19224,904
19214,374
19205,306
19194,803
19185,155
19175,858
19165,287
19155,011
19145,351
19134,362
19125,308
19114,973
19105,165
19095,041
19084,941
19075,550
19064,973
19055,381
19046,030
19035,132
19025,115
19015,585
19004,938
18995,277
18984,924
18975,051
18965,124
18955,517

Compared with United States

Place2025
Delaware4,547
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/7/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, Delaware, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/7/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, Delaware, 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/7/hdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/heating-degree-days/delaware. 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, Delaware, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/7/hdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/heating-degree-days/delaware.

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, Delaware, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/7/hdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/heating-degree-days/delaware (Accessed: 12 October 2026).

BibTeX
@misc{noaa_heating_degree_days_delaware_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, Delaware, 1895 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/7/hdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/heating-degree-days/delaware. 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/7/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, Delaware, 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/7/hdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/heating-degree-days/delaware
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/heating-degree-days/delaware.
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/7/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the heating degree days in Delaware?

Heating degree days in Delaware was 4,547 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 12.6% from 2024. That is the 30th 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 Delaware?

6,030 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 Delaware

All statistics for Delaware | Delaware in figures