| | Snohomish, WA | Littleton, MA | United States |
| Rainfall | 50.3 | 48.5 | 38.1 |
| Snowfall | 3.6 | 56.1 | 27.8 |
| Precipitation Days | 176.8 | 128.4 | 106.2 |
| Sunny | 159 | 199 | 205 |
| Avg. July High | 75.6 | 83.4 | 85.8 |
| Avg. Jan. Low | 34.4 | 15 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 6.8 | 7 |
| UV Index | 2.7 | 3.5 | 4.3 |
| Elevation ft. | 66 | 226 | 2443 |