| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 21 - Jun. 30 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 96137 - Westwood, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 23 | 26 | 29 | 35 | 42 | 47 | 46 | 41 | 34 | 27 | 22 | 33 |
| Avg Max Temp (°F) | 39 | 43 | 48 | 55 | 64 | 73 | 81 | 81 | 74 | 62 | 47 | 39 | 59 |
| Avg Precip (In.) | 6.65 | 6.87 | 3.86 | 2.68 | 2.08 | 1.02 | .18 | .23 | .71 | 1.73 | 3.1 | 5.52 | 34.62 |