# Heating degree days in Maryland

Heating degree days in Maryland was 4,519 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `heating_degree_days_annual`
- Place id: `us-state-24`
- Unit: degree days (base 65°F)
- 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).
- Note: NOAA publishes these for operational monitoring; they can differ from official degree day publications.
- Source: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide (https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/18/hdd/12/12/1895-2025/data.json)
- Publisher page: https://invokely.ai/en/publishers/noaa-ncei
- Retrieved: 2026-10-12
- License: Public domain (US government work); NCEI asks users to cite the nClimDiv dataset
- Citation: 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/18/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/heating-degree-days/maryland
- API: https://invokely.ai/api/v1/series?indicator=heating_degree_days_annual&place=us-state-24

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 4,519 |
| 2024 | 3,963 |
| 2023 | 3,827 |
| 2022 | 4,517 |
| 2021 | 4,159 |
| 2020 | 4,021 |
| 2019 | 4,409 |
| 2018 | 4,647 |
| 2017 | 4,104 |
| 2016 | 4,363 |
| 2015 | 4,609 |
| 2014 | 5,079 |
| 2013 | 4,706 |
| 2012 | 3,946 |
| 2011 | 4,344 |
| 2010 | 4,624 |
| 2009 | 4,728 |
| 2008 | 4,538 |
| 2007 | 4,529 |
| 2006 | 4,101 |
| 2005 | 4,760 |
| 2004 | 4,630 |
| 2003 | 4,971 |
| 2002 | 4,383 |
| 2001 | 4,417 |
| 2000 | 4,757 |
| 1999 | 4,462 |
| 1998 | 3,961 |
| 1997 | 4,780 |
| 1996 | 5,128 |
| 1995 | 4,912 |
| 1994 | 4,840 |
| 1993 | 4,990 |
| 1992 | 4,895 |
| 1991 | 4,262 |
| 1990 | 3,927 |
| 1989 | 5,108 |
| 1988 | 5,164 |
| 1987 | 4,846 |
| 1986 | 4,789 |
| 1985 | 4,587 |
| 1984 | 4,833 |
| 1983 | 4,939 |
| 1982 | 4,917 |
| 1981 | 5,131 |
| 1980 | 5,177 |
| 1979 | 5,048 |
| 1978 | 5,401 |
| 1977 | 5,010 |
| 1976 | 5,106 |
| 1975 | 4,701 |
| 1974 | 4,665 |
| 1973 | 4,595 |
| 1972 | 5,071 |
| 1971 | 4,860 |
| 1970 | 5,131 |
| 1969 | 5,242 |
| 1968 | 5,118 |
| 1967 | 5,243 |
| 1966 | 5,291 |
| 1965 | 5,068 |
| 1964 | 4,905 |
| 1963 | 5,281 |
| 1962 | 5,293 |
| 1961 | 5,146 |
| 1960 | 5,270 |
| 1959 | 4,675 |
| 1958 | 5,465 |
| 1957 | 4,781 |
| 1956 | 4,831 |
| 1955 | 4,997 |
| 1954 | 4,711 |
| 1953 | 4,378 |
| 1952 | 4,798 |
| 1951 | 4,839 |
| 1950 | 4,910 |
| 1949 | 4,344 |
| 1948 | 4,962 |
| 1947 | 5,052 |
| 1946 | 4,361 |
| 1945 | 4,870 |
| 1944 | 5,099 |
| 1943 | 5,160 |
| 1942 | 4,879 |
| 1941 | 4,773 |
| 1940 | 5,615 |
| 1939 | 4,746 |
| 1938 | 4,639 |
| 1937 | 4,977 |
| 1936 | 5,211 |
| 1935 | 5,206 |
| 1934 | 5,286 |
| 1933 | 4,770 |
| 1932 | 4,640 |
| 1931 | 4,478 |
| 1930 | 4,956 |
| 1929 | 4,835 |
| 1928 | 5,023 |
| 1927 | 4,722 |
| 1926 | 5,497 |
| 1925 | 5,081 |
| 1924 | 5,365 |
| 1923 | 4,921 |
| 1922 | 4,809 |
| 1921 | 4,337 |
| 1920 | 5,310 |
| 1919 | 4,857 |
| 1918 | 5,152 |
| 1917 | 5,912 |
| 1916 | 5,336 |
| 1915 | 5,088 |
| 1914 | 5,357 |
| 1913 | 4,425 |
| 1912 | 5,352 |
| 1911 | 4,946 |
| 1910 | 5,150 |
| 1909 | 5,048 |
| 1908 | 5,026 |
| 1907 | 5,538 |
| 1906 | 5,008 |
| 1905 | 5,409 |
| 1904 | 6,029 |
| 1903 | 5,146 |
| 1902 | 5,144 |
| 1901 | 5,605 |
| 1900 | 4,969 |
| 1899 | 5,307 |
| 1898 | 4,964 |
| 1897 | 5,099 |
| 1896 | 5,075 |
| 1895 | 5,640 |