| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 11 - Feb. 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 92881 - Corona, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 41 | 43 | 46 | 51 | 55 | 59 | 60 | 57 | 51 | 43 | 38 | 48 |
| Avg Max Temp (°F) | 66 | 68 | 70 | 75 | 80 | 87 | 93 | 94 | 90 | 82 | 73 | 66 | 79 |
| Avg Precip (In.) | 2.89 | 3.06 | 2.45 | .71 | .2 | .03 | .02 | .16 | .25 | .36 | 1.08 | 1.58 | 12.83 |