| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 10a: 30°F to 35°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 95488 - Westport, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 38 | 39 | 40 | 44 | 49 | 53 | 52 | 52 | 46 | 41 | 38 | 44 |
| Avg Max Temp (°F) | 52 | 54 | 57 | 61 | 66 | 71 | 78 | 79 | 77 | 68 | 56 | 51 | 64 |
| Avg Precip (In.) | 15.81 | 11.17 | 11.07 | 5.23 | 1.72 | .36 | .16 | .5 | .87 | 4.37 | 10.99 | 12.9 | 75.15 |