| 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. 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 94592 - Vallejo, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 42 | 44 | 45 | 49 | 53 | 55 | 55 | 53 | 49 | 43 | 39 | 47 |
| Avg Max Temp (°F) | 57 | 62 | 65 | 69 | 72 | 75 | 78 | 78 | 78 | 74 | 65 | 58 | 69 |
| Avg Precip (In.) | 5.01 | 4.49 | 3.25 | 1.34 | .75 | .17 | .05 | .09 | .34 | 1.35 | 2.99 | 3.53 | 23.34 |