| 2023 Hardiness Zone: | 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 10b: 35F to 40F | |
| Average First Frost Date: | Dec. 21 - Dec. 31 | |
| Average Last Frost Date: | Feb. 11 - Feb. 20 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 91311 - Chatsworth, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 43 | 43 | 46 | 50 | 54 | 58 | 59 | 56 | 51 | 44 | 41 | 49 |
| Avg Max Temp (°F) | 66 | 68 | 70 | 76 | 79 | 86 | 93 | 94 | 90 | 82 | 73 | 67 | 79 |
| Avg Precip (In.) | 3.92 | 3.75 | 3.38 | .71 | .23 | .03 | .02 | .18 | .27 | .38 | 1.59 | 2 | 16.45 |