# Heating degree days in Iowa

Heating degree days in Iowa was 6,444 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `heating_degree_days_annual`
- Place id: `us-state-19`
- 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/13/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/13/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/heating-degree-days/iowa
- API: https://invokely.ai/api/v1/series?indicator=heating_degree_days_annual&place=us-state-19

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 6,444 |
| 2024 | 5,748 |
| 2023 | 6,068 |
| 2022 | 7,209 |
| 2021 | 6,352 |
| 2020 | 6,583 |
| 2019 | 7,348 |
| 2018 | 7,259 |
| 2017 | 6,228 |
| 2016 | 6,089 |
| 2015 | 6,445 |
| 2014 | 7,744 |
| 2013 | 7,407 |
| 2012 | 5,728 |
| 2011 | 6,821 |
| 2010 | 6,960 |
| 2009 | 7,171 |
| 2008 | 7,591 |
| 2007 | 6,744 |
| 2006 | 6,093 |
| 2005 | 6,532 |
| 2004 | 6,545 |
| 2003 | 6,920 |
| 2002 | 6,600 |
| 2001 | 6,531 |
| 2000 | 6,716 |
| 1999 | 6,370 |
| 1998 | 5,983 |
| 1997 | 7,172 |
| 1996 | 7,747 |
| 1995 | 7,271 |
| 1994 | 6,999 |
| 1993 | 7,546 |
| 1992 | 6,686 |
| 1991 | 6,829 |
| 1990 | 6,376 |
| 1989 | 7,373 |
| 1988 | 7,015 |
| 1987 | 5,980 |
| 1986 | 6,747 |
| 1985 | 7,550 |
| 1984 | 6,984 |
| 1983 | 7,268 |
| 1982 | 7,496 |
| 1981 | 6,542 |
| 1980 | 7,085 |
| 1979 | 7,844 |
| 1978 | 7,890 |
| 1977 | 6,976 |
| 1976 | 7,198 |
| 1975 | 7,148 |
| 1974 | 6,981 |
| 1973 | 6,652 |
| 1972 | 7,735 |
| 1971 | 7,103 |
| 1970 | 7,330 |
| 1969 | 7,526 |
| 1968 | 6,980 |
| 1967 | 7,141 |
| 1966 | 7,399 |
| 1965 | 7,253 |
| 1964 | 6,741 |
| 1963 | 7,184 |
| 1962 | 7,419 |
| 1961 | 7,243 |
| 1960 | 7,521 |
| 1959 | 7,392 |
| 1958 | 7,195 |
| 1957 | 7,095 |
| 1956 | 6,949 |
| 1955 | 7,195 |
| 1954 | 6,621 |
| 1953 | 6,604 |
| 1952 | 7,016 |
| 1951 | 7,993 |
| 1950 | 7,780 |
| 1949 | 6,989 |
| 1948 | 7,062 |
| 1947 | 7,221 |
| 1946 | 6,289 |
| 1945 | 7,289 |
| 1944 | 6,918 |
| 1943 | 7,502 |
| 1942 | 6,996 |
| 1941 | 6,439 |
| 1940 | 7,473 |
| 1939 | 6,398 |
| 1938 | 6,340 |
| 1937 | 7,695 |
| 1936 | 7,664 |
| 1935 | 7,218 |
| 1934 | 6,576 |
| 1933 | 6,622 |
| 1932 | 7,291 |
| 1931 | 5,780 |
| 1930 | 6,756 |
| 1929 | 7,771 |
| 1928 | 6,719 |
| 1927 | 6,850 |
| 1926 | 7,275 |
| 1925 | 7,178 |
| 1924 | 7,713 |
| 1923 | 6,981 |
| 1922 | 6,618 |
| 1921 | 6,104 |
| 1920 | 7,169 |
| 1919 | 7,189 |
| 1918 | 6,943 |
| 1917 | 8,169 |
| 1916 | 7,557 |
| 1915 | 7,053 |
| 1914 | 7,005 |
| 1913 | 6,836 |
| 1912 | 7,851 |
| 1911 | 6,988 |
| 1910 | 7,053 |
| 1909 | 7,506 |
| 1908 | 6,717 |
| 1907 | 7,335 |
| 1906 | 7,103 |
| 1905 | 7,503 |
| 1904 | 7,688 |
| 1903 | 7,314 |
| 1902 | 7,204 |
| 1901 | 7,270 |
| 1900 | 6,930 |
| 1899 | 7,427 |
| 1898 | 7,370 |
| 1897 | 7,438 |
| 1896 | 7,054 |
| 1895 | 7,614 |