Heating degree days (F) - Washington (US) - NOAA - Daily
This series is part of the dataset: Heating and cooling degree days (NOAA)
Download Full Dataset (.xlsx)Latest updates. In Washington, heating degree days were 5.0 degrees Fahrenheit on 23 September 2025, versus 7.0 on 22 September.
Sample. There are 16,337 observations overall in the daily series presented in the graph above. The span of time covered by the series goes from January 1981 to September 2025.
History. Check out some simple statistics we calculated on the whole sample: degree days had an average value of 15.1 degrees Fahrenheit; they hit a trough of 0.0 on 3 July 1981; they hit a peak of 55.0 on 23 December 1983.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-09-21 | 9.0 |
| 2025-09-22 | 7.0 |
| 2025-09-23 | 5.0 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Heating degree days |
| Country | Washington (US) |
| Economic concept | Heating needs |
| Data type | Estimate based on daily minimum and maximum temperatures |
| Deflation method | Not applicable |
| Seasonally adjusted | No |
| Rescaling | Population-weighted averages of weather-station observations |
| Frequency | Daily |
| Unit | Degrees Fahrenheit |
| Source | NOAA National Weather Service |
| Source type | Federal Administration |
| Data licence | Not copyrightable under U.S. law |
| Measure type | 65F - (max_daily_temperature + min_daily_temperature) / 2 |
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