| | Baltimore, MD | Arnold, MD | United States |
| Rainfall | 42.3 | 43.7 | 38.1 |
| Snowfall | 18.5 | 13.5 | 27.8 |
| Precipitation Days | 113.6 | 115.9 | 106.2 |
| Sunny | 213 | 210 | 205 |
| Avg. July High | 88.1 | 87.2 | 85.8 |
| Avg. Jan. Low | 27.4 | 28.4 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 4.1 | 4 | 4.3 |
| Elevation ft. | 33 | 135 | 2443 |