| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F 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 9b: 25F to 30F |
| Average First Frost Date: | Jan. 1 - Jan. 10 |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 94586 - Sunol, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 41 | 43 | 45 | 49 | 52 | 55 | 56 | 54 | 49 | 43 | 38 | 47 |
| Avg Max Temp (°F) | 56 | 61 | 64 | 70 | 75 | 82 | 87 | 87 | 84 | 76 | 64 | 56 | 72 |
| Avg Precip (In.) | 3.41 | 3.19 | 2.72 | 1.11 | .49 | .1 | .04 | .07 | .24 | .93 | 2 | 2.3 | 16.61 |