| 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: | Jan. 1 - Jan. 10 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 94597 - Walnut Creek, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 39 | 41 | 43 | 47 | 52 | 54 | 54 | 52 | 47 | 42 | 37 | 45 |
| Avg Max Temp (°F) | 54 | 60 | 64 | 69 | 75 | 81 | 86 | 86 | 83 | 75 | 63 | 55 | 71 |
| Avg Precip (In.) | 4.76 | 4.22 | 3.19 | 1.64 | .89 | .13 | .05 | .08 | .28 | 1.4 | 2.56 | 3.08 | 22.28 |