Glossary termNo. 9 / 10
- Category
- Tank & usage
- Fuel
- —
- Source
- EIA / NWS
A measure of how cold a day is for heating purposes: how far the day's average temperature falls below 65°F. A day that averages 25°F counts as 40 heating degree days (65 − 25).
Dealers and analysts add up HDD to gauge fuel demand — a stretch of cold piles up degree days, which both raises how fast you burn oil and can strain local delivery when everyone needs a fill at once.
Source: EIA / NWS heating-degree-day definition (65°F base).
Filed by Nick Bruzzi