| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F |
| Average First Frost Date: | Jan. 21 - Jan. 31 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 94930 - Fairfax, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 41 | 44 | 45 | 46 | 49 | 52 | 54 | 54 | 53 | 50 | 46 | 41 | 48 |
| Avg Max Temp (°F) | 56 | 61 | 64 | 69 | 73 | 78 | 81 | 81 | 80 | 74 | 63 | 56 | 70 |
| Avg Precip (In.) | 8.08 | 7.61 | 5.74 | 2.01 | .82 | .18 | .05 | .1 | .42 | 1.89 | 5.71 | 5.81 | 38.42 |