Cooling 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, cooling degree days stood at 9.0 degrees Fahrenheit on 23 September 2025, compared to 7.0 on 22 September 2025.
Sample. There are 16,337 observations overall in the daily time series presented in the chart above. The series covers the time period extending from January 1981 to September 2025.
History. Here’s a quick look at a few descriptive statistics we calculated on the whole sample: degree days were equal on average to 2.5 degrees Fahrenheit; they recorded a maximum of 20.0 on 22 July 2006; they hit a trough of 0.0 on 1 January 1981.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-09-21 | 4.0 |
| 2025-09-22 | 7.0 |
| 2025-09-23 | 9.0 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Cooling degree days |
| Country | California (US) |
| Economic concept | Cooling 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 | (max_daily_temperature + min_daily_temperature) / 2 - 65F |
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