| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | 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: | Frost Rare |
| Average Last Frost Date: | No Frost |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 94901 - San Rafael, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 45 | 46 | 48 | 51 | 54 | 55 | 55 | 55 | 52 | 47 | 42 | 49 |
| Avg Max Temp (°F) | 57 | 61 | 64 | 68 | 71 | 76 | 78 | 78 | 77 | 73 | 64 | 57 | 69 |
| Avg Precip (In.) | 7.4 | 6.87 | 5.26 | 1.88 | .88 | .15 | .05 | .09 | .39 | 1.74 | 5.22 | 5.21 | 35.15 |