A heating degree day (HDD) is a measure of how cold a location is. It’s derived by comparing the average outdoor temperature to a baseline of 65 degrees. More extreme cold temperatures result in a higher number of HDDs, which typically translate to an increased demand for space heating by energy consumers.
The below data sets detail the number of HDDs that occurred in the month of March during the past 3 years, as well as the month’s 10-year average, broken down by Census Division.
| Census Division | Mar 2025 | Mar 2024 | Mar 2023 | Mar 10-Year Average |
| New England | 850 | 765 | 849 | 861 |
| Middle Atlantic | 794 | 671 | 795 | 778 |
| East North Central | 849 | 690 | 850 | 799 |
| West North Central | 956 | 737 | 954 | 822 |
| South Atlantic | 301 | 269 | 302 | 307 |
| East South Central | 399 | 358 | 399 | 387 |
| West South Central | 200 | 185 | 197 | 200 |
| Mountain | 778 | 631 | 775 | 634 |
| Pacific | 607 | 492 | 609 | 492 |
| United States | 585 | 489 | 585 | 542 |
Additional HDD data can be found under the Supply and Logistics section on the Member Dashboard of NPGA’s website. For more information, contact NPGA’s Director of State Affairs, Jacob Peterson.
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