| 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: | Jan. 1 - Jan. 10 | |
| Average Last Frost Date: | Feb. 1 - Feb. 10 | |
| 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 91326 - Porter Ranch, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 43 | 44 | 46 | 50 | 54 | 58 | 60 | 57 | 51 | 45 | 41 | 49 |
| Avg Max Temp (°F) | 64 | 66 | 68 | 74 | 78 | 85 | 92 | 93 | 88 | 80 | 71 | 65 | 77 |
| Avg Precip (In.) | 4.37 | 4.3 | 3.85 | .85 | .29 | .05 | .02 | .17 | .33 | .5 | 1.65 | 2.36 | 18.73 |