| 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 91913 - Chula Vista, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 45 | 46 | 49 | 51 | 56 | 59 | 63 | 64 | 62 | 56 | 49 | 44 | 54 |
| Avg Max Temp (°F) | 68 | 69 | 70 | 72 | 73 | 77 | 82 | 83 | 82 | 78 | 73 | 68 | 75 |
| Avg Precip (In.) | 2.6 | 2.33 | 2.61 | .86 | .25 | .1 | .04 | .11 | .27 | .48 | 1.23 | 1.41 | 12.28 |