| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F | |
| 2012 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10b: 35F to 40F | |
| Average First Frost Date: | January 11 - 20 | |
| Average Last Frost Date: | January 1 - 10 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 91910 - Chula Vista, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 46 | 47 | 50 | 52 | 57 | 60 | 64 | 65 | 63 | 57 | 50 | 45 | 55 |
| Avg Max Temp (°F) | 68 | 68 | 70 | 71 | 72 | 75 | 79 | 81 | 80 | 77 | 72 | 68 | 73 |
| Avg Precip (In.) | 2.41 | 2.25 | 2.39 | .8 | .2 | .09 | .03 | .11 | .24 | .43 | 1.19 | 1.36 | 11.5 |