US states by cooling degree days

Florida had the highest cooling degree days of 48 states in 2023, at 4,031 degree days (base 65°F). Montana had the lowest, at 235 degree days (base 65°F). The median was 855 degree days (base 65°F) and the figure for the United States was 1,446 degree days (base 65°F). Source: NOAA National Centers for Environmental Information.

Highest4,031Florida

Lowest235Montana

Median85548 states

United States1,446History

Map of states, 2023

Under 500
500 to 610
610 to 860
860 to 1,200
1,200 to 2,000
2,000 and over
No data

degree days (base 65°F), 2023. Hatched areas have no value for this period. Source: NOAA NCEI, NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. Boundaries: U.S. Census Bureau cartographic boundary files.

All states, 2023

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.

Full ranking

Rank	States	2023 degree days (base 65°F)	Change on 2022
1	Florida	4,031	+3.3%
2	Texas	3,373	+4.6%
3	Louisiana	3,235	+15.9%
4	Arizona	3,175	-0.4%
5	Mississippi	2,569	+9.9%
6	Oklahoma	2,073	-9.2%
7	Alabama	2,061	+0.9%
8	Nevada	2,046	-14.3%
9	Arkansas	1,936	-0.1%
10	South Carolina	1,825	-8.3%
11	Georgia	1,738	-4.2%
12	Kansas	1,601	-4.2%
13	North Carolina	1,381	-9.8%
14	Tennessee	1,356	-10.7%
15	Missouri	1,353	-3.3%
16	New Mexico	1,309	+11.5%
17	Kentucky	1,163	-10.8%
18	Nebraska	1,140	-3.8%
19	Maryland	1,105	-8.8%
20	Delaware	1,077	-14.9%
21	Virginia	1,074	-9.6%
22	Iowa	907	+0.6%
23	Illinois	881	-5.2%
24	California	866	-28.1%
25	New Jersey	844	-19.6%
26	Indiana	836	-15.2%
27	South Dakota	806	-4%
28	West Virginia	693	-15%
29	Ohio	689	-20.2%
30	Pennsylvania	656	-18.9%
31	Connecticut	631	-18.5%
32	New York	628	-17.2%
33	Minnesota	582	+17.3%
34	Idaho	574	-20.1%
35	Rhode Island	566	-22.6%
36	North Dakota	565	+6.4%
37	Wisconsin	563	+5%
38	Massachusetts	562	-20.6%
39	Utah	549	-21.6%
40	Michigan	532	-20.5%
41	Oregon	348	-8.7%
42	New Hampshire	341	-19%
43	Colorado	298	-32.9%
44	Maine	289	-14%
45	Washington	275	-9.8%
46	Vermont	265	-9.9%
47	Wyoming	256	-34.9%
48	Montana	235	-24.9%

Other periods

About this ranking

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.

Every value in the ranking comes from the same publisher and the same period, so the states are compared on one definition. Equal values share a rank.

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/8/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 (US states by cooling degree days, 2023) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/8/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, US states by cooling degree days, 2023. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/8/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023. 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. US states by cooling degree days, 2023. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/8/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023.

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, US states by cooling degree days, 2023 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/8/cdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_us_states_by_cooling_2023,
  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: US states by cooling degree days, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/8/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023. 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/8/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: US states by cooling degree days, 2023
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/8/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/cooling-degree-days/us-states?period=2023.
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/8/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -

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Questions

Which state has the highest cooling degree days?

Florida, with 4,031 degree days (base 65°F) in 2023, according to NOAA National Centers for Environmental Information.

Which state has the lowest cooling degree days?

Montana, with 235 degree days (base 65°F) in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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 2026-10-12.