Climate twins of Mattoon, IL
These are the US cities whose 12-month climate pattern most closely matches Mattoon'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: Mattoon vs its climate twin
Top match: Speedway, IN
| Month | Mattoon | Speedway | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 34.8°F | 20.2°F | 2.61 in | 36.4°F | 21.2°F | 2.59 in |
| February | 39.6°F | 23.4°F | 2.18 in | 41.0°F | 24.0°F | 2.07 in |
| March | 51.3°F | 32.9°F | 2.81 in | 52.1°F | 33.1°F | 3.28 in |
| April | 64.4°F | 43.3°F | 4.78 in | 64.0°F | 43.1°F | 4.08 in |
| May | 74.3°F | 54.0°F | 4.10 in | 73.8°F | 53.7°F | 4.32 in |
| June | 82.8°F | 63.8°F | 4.71 in | 82.1°F | 63.0°F | 5.06 in |
| July | 86.1°F | 66.6°F | 4.26 in | 85.2°F | 66.7°F | 4.29 in |
| August | 84.5°F | 65.1°F | 2.85 in | 84.0°F | 64.7°F | 3.24 in |
| September | 79.2°F | 56.6°F | 3.11 in | 78.1°F | 57.1°F | 2.57 in |
| October | 66.4°F | 46.6°F | 3.77 in | 65.6°F | 45.4°F | 3.25 in |
| November | 51.2°F | 34.2°F | 3.56 in | 52.0°F | 34.8°F | 3.25 in |
| December | 39.7°F | 25.4°F | 2.55 in | 40.8°F | 26.2°F | 2.67 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 →