Climate twins of Chapin, IL
These are the US cities whose 12-month climate pattern most closely matches Chapin'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: Chapin vs its climate twin
Top match: Muncie, IN
| Month | Chapin | Muncie | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 35.7°F | 17.8°F | 2.26 in | 36.0°F | 21.3°F | 2.52 in |
| February | 41.1°F | 21.3°F | 2.14 in | 39.9°F | 23.9°F | 2.27 in |
| March | 52.5°F | 30.5°F | 3.06 in | 50.9°F | 32.5°F | 3.08 in |
| April | 65.1°F | 41.0°F | 4.40 in | 64.1°F | 43.0°F | 3.89 in |
| May | 74.9°F | 52.1°F | 4.81 in | 74.6°F | 54.2°F | 4.36 in |
| June | 83.6°F | 61.8°F | 4.99 in | 83.0°F | 63.6°F | 4.81 in |
| July | 86.8°F | 65.1°F | 3.97 in | 85.8°F | 66.3°F | 4.10 in |
| August | 86.1°F | 62.8°F | 3.47 in | 84.1°F | 63.4°F | 3.38 in |
| September | 80.1°F | 53.8°F | 3.03 in | 78.8°F | 55.7°F | 3.09 in |
| October | 67.8°F | 42.5°F | 3.09 in | 66.3°F | 45.4°F | 2.96 in |
| November | 52.7°F | 31.6°F | 2.75 in | 52.3°F | 35.6°F | 3.23 in |
| December | 40.9°F | 23.3°F | 2.43 in | 40.7°F | 26.9°F | 2.57 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 →