| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 9a: 20°F to 25°F Zone 10a: 30°F to 35°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 Zone 10a: 30°F to 35°F Zone 9b: 25°F to 30°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 1 - Jan. 10 | |
| 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: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 91935 - Jamul, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 41 | 43 | 45 | 48 | 53 | 56 | 61 | 62 | 60 | 53 | 46 | 41 | 51 |
| Avg Max Temp (°F) | 67 | 68 | 71 | 73 | 76 | 82 | 87 | 89 | 86 | 81 | 74 | 68 | 77 |
| Avg Precip (In.) | 3.14 | 2.88 | 3.29 | 1.12 | .38 | .15 | .09 | .15 | .32 | .65 | 1.45 | 1.78 | 15.39 |