| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F | |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 11 - Jan. 20 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 91914 - Chula Vista, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 47 | 50 | 55 | 58 | 62 | 64 | 62 | 55 | 48 | 43 | 53 |
| Avg Max Temp (°F) | 68 | 69 | 71 | 73 | 74 | 79 | 84 | 86 | 84 | 79 | 73 | 68 | 76 |
| Avg Precip (In.) | 3.01 | 2.72 | 3.08 | 1.08 | .38 | .1 | .04 | .11 | .31 | .6 | 1.36 | 1.65 | 14.42 |