| 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 9b: 25F to 30F |
| Average First Frost Date: | Jan. 11 - Jan. 20 |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| 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 94549 - Lafayette, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 40 | 41 | 43 | 47 | 52 | 54 | 55 | 53 | 48 | 42 | 37 | 46 |
| Avg Max Temp (°F) | 54 | 59 | 63 | 68 | 73 | 79 | 83 | 84 | 81 | 74 | 62 | 54 | 69 |
| Avg Precip (In.) | 5.29 | 4.76 | 3.56 | 1.63 | .95 | .13 | .05 | .08 | .28 | 1.45 | 3.01 | 3.52 | 24.69 |