| 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 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 21 - Jan. 31 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 91010 - Duarte, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 44 | 46 | 48 | 53 | 57 | 60 | 61 | 60 | 54 | 46 | 42 | 51 |
| Avg Max Temp (°F) | 67 | 69 | 69 | 74 | 77 | 83 | 89 | 90 | 87 | 80 | 73 | 68 | 77 |
| Avg Precip (In.) | 3.85 | 4.02 | 3.31 | .93 | .36 | .14 | .02 | .15 | .37 | .52 | 1.29 | 2.11 | 17.08 |