| 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: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 92688 - Rancho Santa Margarita, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 41 | 43 | 46 | 51 | 56 | 60 | 60 | 58 | 51 | 43 | 39 | 49 |
| Avg Max Temp (°F) | 67 | 68 | 69 | 74 | 77 | 83 | 90 | 90 | 87 | 81 | 73 | 67 | 77 |
| Avg Precip (In.) | 3.33 | 3.33 | 2.68 | .8 | .28 | .08 | .03 | .14 | .39 | .4 | 1.26 | 1.84 | 14.57 |