| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F | |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 21 - Jan. 31 | |
| 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 91915 - Chula Vista, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 45 | 48 | 51 | 55 | 59 | 62 | 64 | 62 | 56 | 48 | 43 | 53 |
| Avg Max Temp (°F) | 68 | 69 | 71 | 72 | 74 | 79 | 84 | 85 | 83 | 79 | 73 | 68 | 75 |
| Avg Precip (In.) | 2.86 | 2.59 | 2.89 | .99 | .34 | .1 | .04 | .11 | .31 | .55 | 1.3 | 1.54 | 13.62 |