US states by cooling degree days

Florida had the highest cooling degree days of 48 states in 2015, at 4,150 degree days (base 65°F). Montana had the lowest, at 228 degree days (base 65°F). The median was 873 degree days (base 65°F) and the figure for the United States was 1,483 degree days (base 65°F). Source: NOAA National Centers for Environmental Information.

Highest4,150Florida

Lowest228Montana

Median87348 states

United States1,483History

Map of states, 2015

Under 450
450 to 670
670 to 870
870 to 1,300
1,300 to 2,000
2,000 and over
No data

degree days (base 65°F), 2015. 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, 2015

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	2015 degree days (base 65°F)	Change on 2014
1	Florida	4,150	+20.5%
2	Arizona	3,129	+0.4%
3	Louisiana	2,984	+23%
4	Texas	2,908	+8.4%
5	Mississippi	2,380	+19.5%
6	Nevada	2,293	+1.1%
7	South Carolina	2,144	+14.7%
8	Alabama	2,086	+14.3%
9	Oklahoma	1,960	+8%
10	Arkansas	1,856	+22.8%
11	Georgia	1,852	+14%
12	North Carolina	1,638	+18.1%
13	Kansas	1,514	+12.9%
14	Tennessee	1,460	+14.8%
15	Delaware	1,292	+26.9%
16	Missouri	1,271	+14.9%
17	Kentucky	1,247	+12.3%
18	Maryland	1,242	+27.6%
19	Virginia	1,214	+22.1%
20	California	1,157	-1.4%
21	New Mexico	1,064	+7.8%
22	New Jersey	1,006	+33.8%
23	Nebraska	965	+15.6%
24	Indiana	876	+17.4%
25	West Virginia	869	+28.7%
26	Illinois	842	+16.1%
27	Ohio	792	+23.2%
28	Pennsylvania	790	+36.4%
29	Iowa	764	+16.5%
30	New York	733	+34.5%
31	Connecticut	715	+35.2%
32	South Dakota	690	+33.2%
33	Rhode Island	640	+30.1%
34	Idaho	609	+12.8%
35	Massachusetts	590	+32.9%
36	Michigan	562	+26.9%
37	Utah	559	+10.7%
38	North Dakota	501	+38.8%
39	Wisconsin	469	+15.5%
40	Minnesota	466	+18%
41	Oregon	371	+3.6%
42	Colorado	338	+29.5%
43	New Hampshire	332	+33.9%
44	Washington	307	+14.1%
45	Wyoming	285	+38.3%
46	Vermont	263	+46.1%
47	Maine	253	+8.1%
48	Montana	228	+21.9%

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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_us_states_by_cooling_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/cooling-degree-days/us-states?period=2015.
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 4,150 degree days (base 65°F) in 2015, according to NOAA National Centers for Environmental Information.

Which state has the lowest cooling degree days?

Montana, with 228 degree days (base 65°F) in 2015.

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.