| 2023 Hardiness Zone: | 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 10a: 30F to 35F | |
| Average First Frost Date: | No Frost | |
| Average Last Frost Date: | No Frost | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 91766 - Pomona, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 44 | 45 | 47 | 52 | 55 | 59 | 60 | 58 | 53 | 46 | 41 | 50 |
| Avg Max Temp (°F) | 67 | 69 | 69 | 74 | 77 | 83 | 89 | 90 | 87 | 80 | 73 | 68 | 77 |
| Avg Precip (In.) | 4.11 | 4.08 | 3.36 | .93 | .36 | .07 | .03 | .15 | .35 | .54 | 1.39 | 2.21 | 17.59 |