| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | 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. 11 - Jan. 20 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| 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 94595 - Walnut Creek, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 39 | 41 | 43 | 47 | 52 | 54 | 55 | 52 | 47 | 41 | 36 | 45 |
| Avg Max Temp (°F) | 54 | 60 | 63 | 68 | 74 | 80 | 85 | 85 | 82 | 74 | 63 | 55 | 70 |
| Avg Precip (In.) | 5.11 | 4.64 | 3.5 | 1.67 | .82 | .13 | .05 | .08 | .29 | 1.41 | 2.87 | 3.46 | 24.03 |