Data / Cooling degree days / Delaware

Cooling degree days in Delaware

Cooling degree days in Delaware was 1,171 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 5% from 2024. That is the 19th highest of 48 states in 2025.

2025, degree days (base 65°F)1,171
Change on 2024-5%
Rank19th of 48US states ranked
Series high1,4912010
Series low6081927

Next release: Wednesday, 6 October 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Cooling degree days in Delaware, 1895 to 2025

6008001,0001,2001,4001,600189519141933195219711990200920251895: 946 degree days (base 65°F)1896: 932 degree days (base 65°F)1897: 756 degree days (base 65°F)1898: 1,062 degree days (base 65°F)1899: 937 degree days (base 65°F)1900: 1,228 degree days (base 65°F)1901: 1,046 degree days (base 65°F)1902: 782 degree days (base 65°F)1903: 676 degree days (base 65°F)1904: 741 degree days (base 65°F)1905: 841 degree days (base 65°F)1906: 1,022 degree days (base 65°F)1907: 679 degree days (base 65°F)1908: 880 degree days (base 65°F)1909: 720 degree days (base 65°F)1910: 812 degree days (base 65°F)1911: 1,050 degree days (base 65°F)1912: 808 degree days (base 65°F)1913: 870 degree days (base 65°F)1914: 930 degree days (base 65°F)1915: 804 degree days (base 65°F)1916: 838 degree days (base 65°F)1917: 789 degree days (base 65°F)1918: 869 degree days (base 65°F)1919: 875 degree days (base 65°F)1920: 806 degree days (base 65°F)1921: 1,059 degree days (base 65°F)1922: 896 degree days (base 65°F)1923: 876 degree days (base 65°F)1924: 662 degree days (base 65°F)1925: 1,010 degree days (base 65°F)1926: 802 degree days (base 65°F)1927: 608 degree days (base 65°F)1928: 852 degree days (base 65°F)1929: 792 degree days (base 65°F)1930: 1,110 degree days (base 65°F)1931: 1,089 degree days (base 65°F)1932: 931 degree days (base 65°F)1933: 1,015 degree days (base 65°F)1934: 1,053 degree days (base 65°F)1935: 855 degree days (base 65°F)1936: 1,009 degree days (base 65°F)1937: 942 degree days (base 65°F)1938: 942 degree days (base 65°F)1939: 1,038 degree days (base 65°F)1940: 769 degree days (base 65°F)1941: 951 degree days (base 65°F)1942: 991 degree days (base 65°F)1943: 1,085 degree days (base 65°F)1944: 1,059 degree days (base 65°F)1945: 899 degree days (base 65°F)1946: 703 degree days (base 65°F)1947: 912 degree days (base 65°F)1948: 863 degree days (base 65°F)1949: 1,085 degree days (base 65°F)1950: 734 degree days (base 65°F)1951: 884 degree days (base 65°F)1952: 1,027 degree days (base 65°F)1953: 993 degree days (base 65°F)1954: 945 degree days (base 65°F)1955: 1,116 degree days (base 65°F)1956: 799 degree days (base 65°F)1957: 1,034 degree days (base 65°F)1958: 829 degree days (base 65°F)1959: 1,163 degree days (base 65°F)1960: 900 degree days (base 65°F)1961: 1,008 degree days (base 65°F)1962: 770 degree days (base 65°F)1963: 773 degree days (base 65°F)1964: 867 degree days (base 65°F)1965: 899 degree days (base 65°F)1966: 943 degree days (base 65°F)1967: 736 degree days (base 65°F)1968: 980 degree days (base 65°F)1969: 945 degree days (base 65°F)1970: 1,023 degree days (base 65°F)1971: 939 degree days (base 65°F)1972: 797 degree days (base 65°F)1973: 1,091 degree days (base 65°F)1974: 817 degree days (base 65°F)1975: 958 degree days (base 65°F)1976: 855 degree days (base 65°F)1977: 1,020 degree days (base 65°F)1978: 897 degree days (base 65°F)1979: 814 degree days (base 65°F)1980: 1,128 degree days (base 65°F)1981: 889 degree days (base 65°F)1982: 799 degree days (base 65°F)1983: 1,064 degree days (base 65°F)1984: 935 degree days (base 65°F)1985: 940 degree days (base 65°F)1986: 1,017 degree days (base 65°F)1987: 1,136 degree days (base 65°F)1988: 1,081 degree days (base 65°F)1989: 1,009 degree days (base 65°F)1990: 966 degree days (base 65°F)1991: 1,176 degree days (base 65°F)1992: 745 degree days (base 65°F)1993: 1,112 degree days (base 65°F)1994: 1,010 degree days (base 65°F)1995: 1,115 degree days (base 65°F)1996: 893 degree days (base 65°F)1997: 848 degree days (base 65°F)1998: 1,107 degree days (base 65°F)1999: 1,154 degree days (base 65°F)2000: 870 degree days (base 65°F)2001: 1,001 degree days (base 65°F)2002: 1,250 degree days (base 65°F)2003: 1,001 degree days (base 65°F)2004: 1,088 degree days (base 65°F)2005: 1,273 degree days (base 65°F)2006: 1,129 degree days (base 65°F)2007: 1,221 degree days (base 65°F)2008: 1,123 degree days (base 65°F)2009: 980 degree days (base 65°F)2010: 1,491 degree days (base 65°F)2011: 1,352 degree days (base 65°F)2012: 1,337 degree days (base 65°F)2013: 1,092 degree days (base 65°F)2014: 1,018 degree days (base 65°F)2015: 1,292 degree days (base 65°F)2016: 1,358 degree days (base 65°F)2017: 1,167 degree days (base 65°F)2018: 1,393 degree days (base 65°F)2019: 1,375 degree days (base 65°F)2020: 1,256 degree days (base 65°F)2021: 1,254 degree days (base 65°F)2022: 1,265 degree days (base 65°F)2023: 1,077 degree days (base 65°F)2024: 1,232 degree days (base 65°F)2025: 1,171 degree days (base 65°F)
degree days (base 65°F). Source: NOAA NCEI, NOAA Climate at a Glance, January to December cooling 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)
20251,171
20241,232
20231,077
20221,265
20211,254
20201,256
20191,375
20181,393
20171,167
20161,358
20151,292
20141,018
20131,092
20121,337
20111,352
20101,491
2009980
20081,123
20071,221
20061,129
20051,273
20041,088
20031,001
20021,250
20011,001
2000870
19991,154
19981,107
1997848
1996893
19951,115
19941,010
19931,112
1992745
19911,176
1990966
19891,009
19881,081
19871,136
19861,017
1985940
1984935
19831,064
1982799
1981889
19801,128
1979814
1978897
19771,020
1976855
1975958
1974817
19731,091
1972797
1971939
19701,023
1969945
1968980
1967736
1966943
1965899
1964867
1963773
1962770
19611,008
1960900
19591,163
1958829
19571,034
1956799
19551,116
1954945
1953993
19521,027
1951884
1950734
19491,085
1948863
1947912
1946703
1945899
19441,059
19431,085
1942991
1941951
1940769
19391,038
1938942
1937942
19361,009
1935855
19341,053
19331,015
1932931
19311,089
19301,110
1929792
1928852
1927608
1926802
19251,010
1924662
1923876
1922896
19211,059
1920806
1919875
1918869
1917789
1916838
1915804
1914930
1913870
1912808
19111,050
1910812
1909720
1908880
1907679
19061,022
1905841
1904741
1903676
1902782
19011,046
19001,228
1899937
18981,062
1897756
1896932
1895946

Compared with United States

Place2025
Delaware1,171
United States1,502

Rankings

Definition

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/7/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, 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/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, 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/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-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 cooling degree days (base 65°F), contiguous US and statewide. Cooling 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/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/delaware.

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

BibTeX
@misc{noaa_cooling_degree_days_delaware_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, 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/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/delaware. 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/7/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, 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/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/cooling-degree-days/delaware
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/delaware.
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/7/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the cooling degree days in Delaware?

Cooling degree days in Delaware was 1,171 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 5% from 2024. That is the 19th 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 Delaware?

1,491 degree days (base 65°F) in 2010, the highest value since 1895 in this series.

Cooling degree days elsewhere in United States

Related statistics for Delaware

All statistics for Delaware | Delaware in figures