| Columbia, MD | Rockville, MD | United States |
Rainfall | 45 | 42 | 38 |
Snowfall | 17 | 18 | 28 |
Precipitation | 114 | 112 | 106 |
Sunny | 212 | 203 | 205 |
Avg. July High | 88 | 85 | 86 |
Avg. Jan. Low | 24 | 25 | 22 |
Comfort Index (higher=better) | 7.3 | 7.4 | 7 |
UV Index | 3.9 | 4.1 | 4.3 |
Elevation | 404 | 456 | 2443 |