| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Mar. 1 - Mar. 10 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95614 - Cool, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 38 | 40 | 43 | 49 | 55 | 60 | 59 | 56 | 49 | 40 | 36 | 47 |
| Avg Max Temp (°F) | 53 | 57 | 61 | 67 | 75 | 84 | 91 | 90 | 85 | 75 | 61 | 54 | 71 |
| Avg Precip (In.) | 7.55 | 6.46 | 5.94 | 2.98 | 1.78 | .55 | .11 | .13 | .62 | 1.94 | 4.64 | 6.03 | 38.72 |