| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| 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 94582 - San Ramon, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 40 | 42 | 44 | 48 | 52 | 55 | 55 | 54 | 49 | 42 | 37 | 46 |
| Avg Max Temp (°F) | 55 | 60 | 64 | 69 | 74 | 81 | 86 | 85 | 83 | 75 | 63 | 55 | 71 |
| Avg Precip (In.) | 4.05 | 3.68 | 2.97 | 1.31 | .65 | .1 | .04 | .07 | .28 | 1.1 | 2.29 | 2.72 | 19.27 |