| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F | |
| Average First Frost Date: | Nov. 11 - Nov. 20 | |
| Average Last Frost Date: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 91934 - Jacumba, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 36 | 39 | 43 | 48 | 54 | 55 | 51 | 43 | 36 | 33 | 42 |
| Avg Max Temp (°F) | 60 | 62 | 64 | 70 | 76 | 86 | 92 | 92 | 87 | 77 | 67 | 61 | 75 |
| Avg Precip (In.) | 3.08 | 3 | 3.44 | .74 | .27 | .07 | .53 | .64 | .51 | .84 | 1.07 | 1.53 | 15.72 |