Climate twins of Harpers Ferry, WV
These are the US cities whose 12-month climate pattern most closely matches Harpers Ferry's. Each "twin" must be at least 140 miles away to avoid trivial near-neighbor matches. Similarity is computed across all 24 monthly metrics (12 average temperatures + 12 average precipitations), normalized so temperature and precipitation contribute equally.
Side-by-side: Harpers Ferry vs its climate twin
Top match: Brookside, OH
| Month | Harpers Ferry | Brookside | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 41.2°F | 21.1°F | 3.13 in | 38.7°F | 21.7°F | 3.44 in |
| February | 44.2°F | 23.0°F | 2.41 in | 41.8°F | 23.1°F | 2.67 in |
| March | 52.5°F | 29.0°F | 3.72 in | 51.2°F | 29.8°F | 3.78 in |
| April | 64.7°F | 38.6°F | 3.60 in | 64.5°F | 39.6°F | 3.52 in |
| May | 73.5°F | 48.8°F | 4.57 in | 73.9°F | 50.1°F | 4.20 in |
| June | 82.0°F | 58.2°F | 4.16 in | 81.4°F | 59.3°F | 4.26 in |
| July | 86.1°F | 62.4°F | 4.28 in | 85.0°F | 63.8°F | 4.09 in |
| August | 84.8°F | 60.9°F | 3.27 in | 84.6°F | 62.7°F | 3.19 in |
| September | 78.1°F | 53.7°F | 4.40 in | 78.7°F | 56.1°F | 3.50 in |
| October | 66.8°F | 42.0°F | 3.41 in | 66.4°F | 44.0°F | 2.94 in |
| November | 55.7°F | 32.1°F | 3.08 in | 53.7°F | 33.7°F | 2.90 in |
| December | 44.8°F | 25.3°F | 3.46 in | 43.2°F | 26.9°F | 3.39 in |
How this is computed
Each city is represented by a 24-dimensional vector: 12 monthly average temperatures and 12 monthly average precipitations. Each dimension is z-score normalized across the population of US cities, so that temperature variance and precipitation variance contribute proportionally. Distance between cities is Euclidean. We filter out cities within 2° latitude/longitude (~140 miles) so that "twins" mean climatically similar but geographically distinct — not just the neighboring town. Full methodology →