| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95968 - Palermo, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 40 | 43 | 46 | 52 | 58 | 61 | 59 | 55 | 49 | 41 | 37 | 48 |
| Avg Max Temp (°F) | 54 | 61 | 65 | 72 | 81 | 89 | 95 | 93 | 88 | 78 | 63 | 55 | 75 |
| Avg Precip (In.) | 5.18 | 4.7 | 4.27 | 1.87 | 1.03 | .34 | .08 | .16 | .49 | 1.43 | 3.34 | 3.85 | 26.73 |