Climate twins of Napoleon, OH
These are the US cities whose 12-month climate pattern most closely matches Napoleon'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: Napoleon vs its climate twin
Top match: Plymouth, IN
| Month | Napoleon | Plymouth | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.8°F | 17.4°F | 2.53 in | 31.4°F | 16.7°F | 2.63 in |
| February | 35.5°F | 18.8°F | 2.25 in | 35.4°F | 18.5°F | 2.33 in |
| March | 46.1°F | 27.6°F | 2.60 in | 47.1°F | 27.7°F | 2.45 in |
| April | 59.6°F | 37.2°F | 3.65 in | 59.8°F | 38.0°F | 3.63 in |
| May | 71.5°F | 49.9°F | 4.02 in | 71.2°F | 49.4°F | 4.33 in |
| June | 80.8°F | 59.8°F | 3.67 in | 80.6°F | 59.3°F | 4.24 in |
| July | 83.9°F | 63.1°F | 3.45 in | 83.8°F | 62.7°F | 4.39 in |
| August | 83.0°F | 60.4°F | 3.71 in | 81.9°F | 61.0°F | 4.05 in |
| September | 76.3°F | 52.8°F | 3.31 in | 76.1°F | 53.5°F | 3.20 in |
| October | 63.7°F | 42.3°F | 2.74 in | 63.3°F | 42.4°F | 3.38 in |
| November | 49.1°F | 32.0°F | 2.86 in | 48.4°F | 31.8°F | 3.03 in |
| December | 37.4°F | 23.8°F | 2.53 in | 36.7°F | 23.0°F | 2.60 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 →