Climate twins of Sullivan, WI
These are the US cities whose 12-month climate pattern most closely matches Sullivan'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: Sullivan vs its climate twin
Top match: Zwingle, IA
| Month | Sullivan | Zwingle | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 26.9°F | 11.3°F | 1.68 in | 26.5°F | 11.1°F | 1.32 in |
| February | 31.0°F | 14.1°F | 1.78 in | 30.9°F | 15.0°F | 1.57 in |
| March | 43.2°F | 23.9°F | 2.13 in | 44.1°F | 26.3°F | 2.25 in |
| April | 56.4°F | 34.7°F | 3.85 in | 57.7°F | 37.2°F | 4.06 in |
| May | 68.5°F | 46.0°F | 4.25 in | 69.2°F | 48.5°F | 4.30 in |
| June | 78.3°F | 56.1°F | 4.90 in | 78.5°F | 58.6°F | 5.19 in |
| July | 82.1°F | 60.1°F | 4.11 in | 81.5°F | 62.0°F | 4.80 in |
| August | 80.3°F | 58.6°F | 3.97 in | 79.6°F | 60.0°F | 3.95 in |
| September | 73.3°F | 50.8°F | 3.47 in | 72.9°F | 51.8°F | 3.82 in |
| October | 60.0°F | 39.5°F | 2.95 in | 59.9°F | 39.9°F | 2.93 in |
| November | 45.0°F | 27.9°F | 2.35 in | 44.8°F | 28.1°F | 2.21 in |
| December | 32.5°F | 17.4°F | 2.08 in | 31.8°F | 17.2°F | 1.80 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 →