| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | No Frost | |
| Average Last Frost Date: | Frost Rare | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 92780 - Tustin, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 45 | 46 | 48 | 50 | 55 | 58 | 62 | 63 | 61 | 56 | 48 | 44 | 53 |
| Avg Max Temp (°F) | 68 | 69 | 69 | 73 | 74 | 78 | 82 | 84 | 83 | 78 | 73 | 68 | 75 |
| Avg Precip (In.) | 2.98 | 2.99 | 2.66 | .7 | .25 | .11 | .02 | .12 | .32 | .38 | 1.13 | 1.73 | 13.4 |