Heating degree days (F) - California (US) - NOAA - Daily
This series is part of the dataset: Heating and cooling degree days (NOAA)
Download Full Dataset (.xlsx)Latest updates. In California, heating degree days were 2.0 degrees Fahrenheit on 17 September 2026, versus 1.0 on the previous day.
Sample. In this daily time series, there are 16,696 data points overall. The series covers the time period going from January 1981 to September 2026.
History. Here's a glimpse of some summary statistics we calculated on the entire sample: degree days averaged 6.9 degrees Fahrenheit; they reached their lowest level of 0.0 on 29 April 1981; they reached their maximum of 36.0 on 22 December 1990.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-09-15 | 0 |
| 2026-09-16 | 1.00000 |
| 2026-09-17 | 2.00000 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Heating degree days |
| Country | California (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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