Climate twins of Seymour, IA
These are the US cities whose 12-month climate pattern most closely matches Seymour'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: Seymour vs its climate twin
Top match: Walcott, IA
| Month | Seymour | Walcott | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.7°F | 12.0°F | 0.99 in | 29.9°F | 14.0°F | 1.14 in |
| February | 37.7°F | 16.0°F | 1.26 in | 34.4°F | 18.1°F | 1.44 in |
| March | 50.5°F | 26.5°F | 2.15 in | 48.3°F | 29.0°F | 2.34 in |
| April | 62.9°F | 37.1°F | 3.88 in | 61.4°F | 39.3°F | 3.61 in |
| May | 72.3°F | 48.4°F | 5.22 in | 72.5°F | 51.0°F | 4.82 in |
| June | 81.5°F | 59.1°F | 4.71 in | 81.3°F | 60.9°F | 4.73 in |
| July | 85.8°F | 63.1°F | 3.45 in | 83.8°F | 63.6°F | 4.07 in |
| August | 84.3°F | 60.9°F | 3.86 in | 82.0°F | 61.5°F | 3.96 in |
| September | 76.3°F | 52.1°F | 3.85 in | 76.2°F | 53.0°F | 3.47 in |
| October | 64.4°F | 40.6°F | 3.01 in | 63.4°F | 41.7°F | 2.70 in |
| November | 50.3°F | 27.9°F | 2.19 in | 48.3°F | 30.0°F | 2.25 in |
| December | 38.0°F | 18.2°F | 1.46 in | 35.1°F | 20.1°F | 1.64 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 →