| | Williamstown, MA | Sonoma, CA | United States |
| Rainfall | 44.4 | 30.7 | 38.1 |
| Snowfall | 63.3 | 0 | 27.8 |
| Precipitation Days | 129.5 | 71.7 | 106.2 |
| Sunny | 185 | 262 | 205 |
| Avg. July High | 79.5 | 85.1 | 85.8 |
| Avg. Jan. Low | 12.1 | 37.9 | 21.7 |
| Comfort Index (higher=better) | 6.5 | 8.4 | 7 |
| UV Index | 3.3 | 4.9 | 4.3 |
| Elevation ft. | 682 | 85 | 2443 |