| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F | |
| Average First Frost Date: | Dec. 21 - Dec. 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: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 92021 - El Cajon, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 41 | 43 | 46 | 48 | 54 | 58 | 61 | 63 | 60 | 54 | 46 | 41 | 51 |
| Avg Max Temp (°F) | 68 | 69 | 71 | 73 | 76 | 82 | 87 | 89 | 86 | 81 | 74 | 68 | 77 |
| Avg Precip (In.) | 2.93 | 2.7 | 3.03 | 1.02 | .34 | .11 | .04 | .11 | .31 | .55 | 1.34 | 1.69 | 14.18 |