| 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 94903 - San Rafael, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 45 | 46 | 47 | 50 | 53 | 55 | 55 | 54 | 51 | 47 | 42 | 49 |
| Avg Max Temp (°F) | 56 | 61 | 64 | 69 | 72 | 78 | 81 | 81 | 79 | 74 | 64 | 57 | 70 |
| Avg Precip (In.) | 7.53 | 7 | 5.06 | 1.73 | .71 | .13 | .06 | .09 | .33 | 1.64 | 4.97 | 5.26 | 34.52 |