| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F | |
| 2012 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Frost Rare | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 92610 - Foothill Ranch, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 41 | 43 | 46 | 51 | 55 | 59 | 60 | 58 | 51 | 43 | 39 | 49 |
| Avg Max Temp (°F) | 66 | 68 | 69 | 74 | 77 | 83 | 89 | 90 | 87 | 81 | 73 | 67 | 77 |
| Avg Precip (In.) | 3.97 | 3.7 | 2.79 | .84 | .33 | .09 | .02 | .14 | .42 | .43 | 1.19 | 1.93 | 15.84 |