Data / Cooling degree days / Iowa

Cooling degree days in Iowa

Cooling degree days in Iowa was 953 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 6.5% from 2024. That is the 24th highest of 48 states in 2025.

2025, degree days (base 65°F)953
Change on 2024+6.5%
Rank24th of 48US states ranked
Series high1,3461936
Series low4531915

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Cooling degree days in Iowa, 1895 to 2025

4006008001,0001,2001,400189519141933195219711990200920251895: 826 degree days (base 65°F)1896: 778 degree days (base 65°F)1897: 845 degree days (base 65°F)1898: 805 degree days (base 65°F)1899: 820 degree days (base 65°F)1900: 983 degree days (base 65°F)1901: 1,132 degree days (base 65°F)1902: 605 degree days (base 65°F)1903: 580 degree days (base 65°F)1904: 571 degree days (base 65°F)1905: 768 degree days (base 65°F)1906: 789 degree days (base 65°F)1907: 624 degree days (base 65°F)1908: 709 degree days (base 65°F)1909: 777 degree days (base 65°F)1910: 794 degree days (base 65°F)1911: 1,027 degree days (base 65°F)1912: 720 degree days (base 65°F)1913: 994 degree days (base 65°F)1914: 985 degree days (base 65°F)1915: 453 degree days (base 65°F)1916: 888 degree days (base 65°F)1917: 607 degree days (base 65°F)1918: 888 degree days (base 65°F)1919: 929 degree days (base 65°F)1920: 715 degree days (base 65°F)1921: 1,102 degree days (base 65°F)1922: 878 degree days (base 65°F)1923: 821 degree days (base 65°F)1924: 522 degree days (base 65°F)1925: 845 degree days (base 65°F)1926: 782 degree days (base 65°F)1927: 618 degree days (base 65°F)1928: 679 degree days (base 65°F)1929: 670 degree days (base 65°F)1930: 950 degree days (base 65°F)1931: 1,106 degree days (base 65°F)1932: 862 degree days (base 65°F)1933: 1,069 degree days (base 65°F)1934: 1,255 degree days (base 65°F)1935: 850 degree days (base 65°F)1936: 1,346 degree days (base 65°F)1937: 974 degree days (base 65°F)1938: 973 degree days (base 65°F)1939: 976 degree days (base 65°F)1940: 861 degree days (base 65°F)1941: 990 degree days (base 65°F)1942: 738 degree days (base 65°F)1943: 815 degree days (base 65°F)1944: 825 degree days (base 65°F)1945: 577 degree days (base 65°F)1946: 656 degree days (base 65°F)1947: 946 degree days (base 65°F)1948: 849 degree days (base 65°F)1949: 905 degree days (base 65°F)1950: 531 degree days (base 65°F)1951: 569 degree days (base 65°F)1952: 824 degree days (base 65°F)1953: 886 degree days (base 65°F)1954: 911 degree days (base 65°F)1955: 1,075 degree days (base 65°F)1956: 879 degree days (base 65°F)1957: 810 degree days (base 65°F)1958: 631 degree days (base 65°F)1959: 879 degree days (base 65°F)1960: 710 degree days (base 65°F)1961: 674 degree days (base 65°F)1962: 721 degree days (base 65°F)1963: 886 degree days (base 65°F)1964: 822 degree days (base 65°F)1965: 698 degree days (base 65°F)1966: 697 degree days (base 65°F)1967: 516 degree days (base 65°F)1968: 733 degree days (base 65°F)1969: 702 degree days (base 65°F)1970: 817 degree days (base 65°F)1971: 787 degree days (base 65°F)1972: 697 degree days (base 65°F)1973: 825 degree days (base 65°F)1974: 679 degree days (base 65°F)1975: 843 degree days (base 65°F)1976: 737 degree days (base 65°F)1977: 947 degree days (base 65°F)1978: 811 degree days (base 65°F)1979: 723 degree days (base 65°F)1980: 945 degree days (base 65°F)1981: 721 degree days (base 65°F)1982: 682 degree days (base 65°F)1983: 1,060 degree days (base 65°F)1984: 764 degree days (base 65°F)1985: 676 degree days (base 65°F)1986: 816 degree days (base 65°F)1987: 984 degree days (base 65°F)1988: 1,157 degree days (base 65°F)1989: 737 degree days (base 65°F)1990: 777 degree days (base 65°F)1991: 933 degree days (base 65°F)1992: 476 degree days (base 65°F)1993: 639 degree days (base 65°F)1994: 690 degree days (base 65°F)1995: 888 degree days (base 65°F)1996: 617 degree days (base 65°F)1997: 722 degree days (base 65°F)1998: 936 degree days (base 65°F)1999: 818 degree days (base 65°F)2000: 808 degree days (base 65°F)2001: 819 degree days (base 65°F)2002: 912 degree days (base 65°F)2003: 751 degree days (base 65°F)2004: 606 degree days (base 65°F)2005: 956 degree days (base 65°F)2006: 849 degree days (base 65°F)2007: 981 degree days (base 65°F)2008: 710 degree days (base 65°F)2009: 558 degree days (base 65°F)2010: 950 degree days (base 65°F)2011: 894 degree days (base 65°F)2012: 1,070 degree days (base 65°F)2013: 800 degree days (base 65°F)2014: 656 degree days (base 65°F)2015: 764 degree days (base 65°F)2016: 942 degree days (base 65°F)2017: 807 degree days (base 65°F)2018: 1,005 degree days (base 65°F)2019: 830 degree days (base 65°F)2020: 879 degree days (base 65°F)2021: 977 degree days (base 65°F)2022: 902 degree days (base 65°F)2023: 907 degree days (base 65°F)2024: 895 degree days (base 65°F)2025: 953 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)
2025953
2024895
2023907
2022902
2021977
2020879
2019830
20181,005
2017807
2016942
2015764
2014656
2013800
20121,070
2011894
2010950
2009558
2008710
2007981
2006849
2005956
2004606
2003751
2002912
2001819
2000808
1999818
1998936
1997722
1996617
1995888
1994690
1993639
1992476
1991933
1990777
1989737
19881,157
1987984
1986816
1985676
1984764
19831,060
1982682
1981721
1980945
1979723
1978811
1977947
1976737
1975843
1974679
1973825
1972697
1971787
1970817
1969702
1968733
1967516
1966697
1965698
1964822
1963886
1962721
1961674
1960710
1959879
1958631
1957810
1956879
19551,075
1954911
1953886
1952824
1951569
1950531
1949905
1948849
1947946
1946656
1945577
1944825
1943815
1942738
1941990
1940861
1939976
1938973
1937974
19361,346
1935850
19341,255
19331,069
1932862
19311,106
1930950
1929670
1928679
1927618
1926782
1925845
1924522
1923821
1922878
19211,102
1920715
1919929
1918888
1917607
1916888
1915453
1914985
1913994
1912720
19111,027
1910794
1909777
1908709
1907624
1906789
1905768
1904571
1903580
1902605
19011,132
1900983
1899820
1898805
1897845
1896778
1895826

Compared with United States

Place2025
Iowa953
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/13/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, 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/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, 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/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-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 cooling degree days (base 65°F), contiguous US and statewide. Cooling 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/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/iowa.

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

BibTeX
@misc{noaa_cooling_degree_days_iowa_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, 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/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/iowa. 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/13/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, 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/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/cooling-degree-days/iowa
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/iowa.
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/13/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the cooling degree days in Iowa?

Cooling degree days in Iowa was 953 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 6.5% from 2024. That is the 24th 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 Iowa?

1,346 degree days (base 65°F) in 1936, the highest value since 1895 in this series.

Cooling degree days elsewhere in United States

Related statistics for Iowa

All statistics for Iowa | Iowa in figures