Climate twins of Union, OH
These are the US cities whose 12-month climate pattern most closely matches Union'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: Union vs its climate twin
Top match: Hardin, IL
| Month | Union | Hardin | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 37.1°F | 21.8°F | 3.08 in | 37.7°F | 19.7°F | 2.35 in |
| February | 41.2°F | 24.5°F | 2.35 in | 43.3°F | 23.3°F | 2.21 in |
| March | 51.5°F | 32.7°F | 3.50 in | 54.9°F | 32.5°F | 3.20 in |
| April | 64.5°F | 42.9°F | 4.46 in | 66.9°F | 42.7°F | 4.40 in |
| May | 74.2°F | 53.8°F | 4.51 in | 75.2°F | 53.2°F | 5.00 in |
| June | 82.6°F | 62.7°F | 4.14 in | 83.4°F | 62.1°F | 4.17 in |
| July | 85.9°F | 66.1°F | 3.95 in | 86.8°F | 66.0°F | 4.24 in |
| August | 84.6°F | 64.3°F | 2.96 in | 85.1°F | 64.0°F | 3.16 in |
| September | 78.6°F | 56.8°F | 3.31 in | 78.5°F | 55.7°F | 3.49 in |
| October | 66.2°F | 45.9°F | 2.95 in | 67.3°F | 44.4°F | 3.28 in |
| November | 52.7°F | 35.4°F | 3.07 in | 53.7°F | 33.4°F | 3.28 in |
| December | 41.5°F | 27.1°F | 3.05 in | 41.4°F | 24.4°F | 2.47 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 →