| 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: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 94951 - Penngrove, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 40 | 41 | 43 | 47 | 51 | 53 | 53 | 51 | 48 | 42 | 37 | 45 |
| Avg Max Temp (°F) | 56 | 60 | 63 | 69 | 74 | 81 | 85 | 85 | 83 | 76 | 64 | 57 | 71 |
| Avg Precip (In.) | 9.31 | 7.37 | 6.62 | 2.41 | .82 | .22 | .07 | .13 | .5 | 2.32 | 5.8 | 6.37 | 41.94 |