| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F 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. 11 - Jan. 20 | |
| Average Last Frost Date: | Feb. 21 - Feb. 29 | |
| 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 91342 - Sylmar, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 43 | 44 | 46 | 50 | 55 | 59 | 60 | 58 | 52 | 46 | 42 | 50 |
| Avg Max Temp (°F) | 65 | 67 | 69 | 74 | 78 | 85 | 92 | 93 | 87 | 80 | 71 | 65 | 77 |
| Avg Precip (In.) | 4.44 | 4.6 | 4.17 | 1.08 | .49 | .13 | .03 | .21 | .4 | .66 | 1.52 | 2.43 | 20.16 |