| 2023 Hardiness Zone: | 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: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 94002 - Belmont, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 42 | 43 | 44 | 48 | 51 | 53 | 53 | 52 | 48 | 43 | 39 | 46 |
| Avg Max Temp (°F) | 58 | 62 | 65 | 70 | 73 | 78 | 80 | 80 | 79 | 75 | 64 | 58 | 70 |
| Avg Precip (In.) | 5.34 | 5.25 | 4.47 | 1.56 | .58 | .14 | .08 | .13 | .31 | 1.33 | 3.41 | 3.8 | 26.4 |