| | Waltham, MA | Grinnell, IA | United States |
| Rainfall | 47.7 | 36.6 | 38.1 |
| Snowfall | 50.2 | 27.2 | 27.8 |
| Precipitation Days | 130.6 | 103.8 | 106.2 |
| Sunny | 197 | 196 | 205 |
| Avg. July High | 82.9 | 83.9 | 85.8 |
| Avg. Jan. Low | 17.1 | 9.8 | 21.7 |
| Comfort Index (higher=better) | 6.9 | 6.8 | 7 |
| UV Index | 3.5 | 3.7 | 4.3 |
| Elevation ft. | 66 | 1014 | 2443 |