Data / Heating degree days / Iowa

Heating degree days in Iowa

Heating degree days in Iowa was 6,444 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 12.1% from 2024. That is the 12th highest of 48 states in 2025.

2025, degree days (base 65°F)6,444
Change on 2024+12.1%
Rank12th of 48US states ranked
Series high8,1691917
Series low5,7282012

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Heating degree days in Iowa, 1895 to 2025

5,5006,0006,5007,0007,5008,0008,500189519141933195219711990200920251895: 7,614 degree days (base 65°F)1896: 7,054 degree days (base 65°F)1897: 7,438 degree days (base 65°F)1898: 7,370 degree days (base 65°F)1899: 7,427 degree days (base 65°F)1900: 6,930 degree days (base 65°F)1901: 7,270 degree days (base 65°F)1902: 7,204 degree days (base 65°F)1903: 7,314 degree days (base 65°F)1904: 7,688 degree days (base 65°F)1905: 7,503 degree days (base 65°F)1906: 7,103 degree days (base 65°F)1907: 7,335 degree days (base 65°F)1908: 6,717 degree days (base 65°F)1909: 7,506 degree days (base 65°F)1910: 7,053 degree days (base 65°F)1911: 6,988 degree days (base 65°F)1912: 7,851 degree days (base 65°F)1913: 6,836 degree days (base 65°F)1914: 7,005 degree days (base 65°F)1915: 7,053 degree days (base 65°F)1916: 7,557 degree days (base 65°F)1917: 8,169 degree days (base 65°F)1918: 6,943 degree days (base 65°F)1919: 7,189 degree days (base 65°F)1920: 7,169 degree days (base 65°F)1921: 6,104 degree days (base 65°F)1922: 6,618 degree days (base 65°F)1923: 6,981 degree days (base 65°F)1924: 7,713 degree days (base 65°F)1925: 7,178 degree days (base 65°F)1926: 7,275 degree days (base 65°F)1927: 6,850 degree days (base 65°F)1928: 6,719 degree days (base 65°F)1929: 7,771 degree days (base 65°F)1930: 6,756 degree days (base 65°F)1931: 5,780 degree days (base 65°F)1932: 7,291 degree days (base 65°F)1933: 6,622 degree days (base 65°F)1934: 6,576 degree days (base 65°F)1935: 7,218 degree days (base 65°F)1936: 7,664 degree days (base 65°F)1937: 7,695 degree days (base 65°F)1938: 6,340 degree days (base 65°F)1939: 6,398 degree days (base 65°F)1940: 7,473 degree days (base 65°F)1941: 6,439 degree days (base 65°F)1942: 6,996 degree days (base 65°F)1943: 7,502 degree days (base 65°F)1944: 6,918 degree days (base 65°F)1945: 7,289 degree days (base 65°F)1946: 6,289 degree days (base 65°F)1947: 7,221 degree days (base 65°F)1948: 7,062 degree days (base 65°F)1949: 6,989 degree days (base 65°F)1950: 7,780 degree days (base 65°F)1951: 7,993 degree days (base 65°F)1952: 7,016 degree days (base 65°F)1953: 6,604 degree days (base 65°F)1954: 6,621 degree days (base 65°F)1955: 7,195 degree days (base 65°F)1956: 6,949 degree days (base 65°F)1957: 7,095 degree days (base 65°F)1958: 7,195 degree days (base 65°F)1959: 7,392 degree days (base 65°F)1960: 7,521 degree days (base 65°F)1961: 7,243 degree days (base 65°F)1962: 7,419 degree days (base 65°F)1963: 7,184 degree days (base 65°F)1964: 6,741 degree days (base 65°F)1965: 7,253 degree days (base 65°F)1966: 7,399 degree days (base 65°F)1967: 7,141 degree days (base 65°F)1968: 6,980 degree days (base 65°F)1969: 7,526 degree days (base 65°F)1970: 7,330 degree days (base 65°F)1971: 7,103 degree days (base 65°F)1972: 7,735 degree days (base 65°F)1973: 6,652 degree days (base 65°F)1974: 6,981 degree days (base 65°F)1975: 7,148 degree days (base 65°F)1976: 7,198 degree days (base 65°F)1977: 6,976 degree days (base 65°F)1978: 7,890 degree days (base 65°F)1979: 7,844 degree days (base 65°F)1980: 7,085 degree days (base 65°F)1981: 6,542 degree days (base 65°F)1982: 7,496 degree days (base 65°F)1983: 7,268 degree days (base 65°F)1984: 6,984 degree days (base 65°F)1985: 7,550 degree days (base 65°F)1986: 6,747 degree days (base 65°F)1987: 5,980 degree days (base 65°F)1988: 7,015 degree days (base 65°F)1989: 7,373 degree days (base 65°F)1990: 6,376 degree days (base 65°F)1991: 6,829 degree days (base 65°F)1992: 6,686 degree days (base 65°F)1993: 7,546 degree days (base 65°F)1994: 6,999 degree days (base 65°F)1995: 7,271 degree days (base 65°F)1996: 7,747 degree days (base 65°F)1997: 7,172 degree days (base 65°F)1998: 5,983 degree days (base 65°F)1999: 6,370 degree days (base 65°F)2000: 6,716 degree days (base 65°F)2001: 6,531 degree days (base 65°F)2002: 6,600 degree days (base 65°F)2003: 6,920 degree days (base 65°F)2004: 6,545 degree days (base 65°F)2005: 6,532 degree days (base 65°F)2006: 6,093 degree days (base 65°F)2007: 6,744 degree days (base 65°F)2008: 7,591 degree days (base 65°F)2009: 7,171 degree days (base 65°F)2010: 6,960 degree days (base 65°F)2011: 6,821 degree days (base 65°F)2012: 5,728 degree days (base 65°F)2013: 7,407 degree days (base 65°F)2014: 7,744 degree days (base 65°F)2015: 6,445 degree days (base 65°F)2016: 6,089 degree days (base 65°F)2017: 6,228 degree days (base 65°F)2018: 7,259 degree days (base 65°F)2019: 7,348 degree days (base 65°F)2020: 6,583 degree days (base 65°F)2021: 6,352 degree days (base 65°F)2022: 7,209 degree days (base 65°F)2023: 6,068 degree days (base 65°F)2024: 5,748 degree days (base 65°F)2025: 6,444 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)
20256,444
20245,748
20236,068
20227,209
20216,352
20206,583
20197,348
20187,259
20176,228
20166,089
20156,445
20147,744
20137,407
20125,728
20116,821
20106,960
20097,171
20087,591
20076,744
20066,093
20056,532
20046,545
20036,920
20026,600
20016,531
20006,716
19996,370
19985,983
19977,172
19967,747
19957,271
19946,999
19937,546
19926,686
19916,829
19906,376
19897,373
19887,015
19875,980
19866,747
19857,550
19846,984
19837,268
19827,496
19816,542
19807,085
19797,844
19787,890
19776,976
19767,198
19757,148
19746,981
19736,652
19727,735
19717,103
19707,330
19697,526
19686,980
19677,141
19667,399
19657,253
19646,741
19637,184
19627,419
19617,243
19607,521
19597,392
19587,195
19577,095
19566,949
19557,195
19546,621
19536,604
19527,016
19517,993
19507,780
19496,989
19487,062
19477,221
19466,289
19457,289
19446,918
19437,502
19426,996
19416,439
19407,473
19396,398
19386,340
19377,695
19367,664
19357,218
19346,576
19336,622
19327,291
19315,780
19306,756
19297,771
19286,719
19276,850
19267,275
19257,178
19247,713
19236,981
19226,618
19216,104
19207,169
19197,189
19186,943
19178,169
19167,557
19157,053
19147,005
19136,836
19127,851
19116,988
19107,053
19097,506
19086,717
19077,335
19067,103
19057,503
19047,688
19037,314
19027,204
19017,270
19006,930
18997,427
18987,370
18977,438
18967,054
18957,614

Compared with United States

Place2025
Iowa6,444
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/13/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, Iowa, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/13/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, Iowa, 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/13/hdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/heating-degree-days/iowa. 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, Iowa, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/13/hdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/heating-degree-days/iowa.

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, Iowa, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/13/hdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/heating-degree-days/iowa (Accessed: 12 October 2026).

BibTeX
@misc{noaa_heating_degree_days_iowa_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, Iowa, 1895 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/13/hdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/heating-degree-days/iowa. 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/13/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, Iowa, 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/13/hdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/heating-degree-days/iowa
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/heating-degree-days/iowa.
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/13/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the heating degree days in Iowa?

Heating degree days in Iowa was 6,444 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 12.1% from 2024. That is the 12th 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 Iowa?

8,169 degree days (base 65°F) in 1917, the highest value since 1895 in this series.

Heating degree days elsewhere in United States

Related statistics for Iowa

All statistics for Iowa | Iowa in figures