Climate twins of Sullivan, IL
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: Pearl, IL
| Month | Sullivan | Pearl | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 35.3°F | 18.5°F | 2.41 in | 35.4°F | 18.4°F | 2.06 in |
| February | 40.2°F | 21.9°F | 2.23 in | 40.5°F | 21.9°F | 2.05 in |
| March | 51.2°F | 31.1°F | 2.83 in | 51.7°F | 31.5°F | 2.91 in |
| April | 64.7°F | 41.9°F | 4.48 in | 64.1°F | 41.9°F | 4.41 in |
| May | 74.6°F | 53.4°F | 4.98 in | 73.9°F | 53.2°F | 4.81 in |
| June | 83.2°F | 62.7°F | 4.95 in | 82.5°F | 62.3°F | 4.67 in |
| July | 86.0°F | 65.2°F | 4.35 in | 85.6°F | 65.7°F | 3.87 in |
| August | 85.1°F | 62.3°F | 3.16 in | 84.4°F | 63.6°F | 3.35 in |
| September | 80.1°F | 54.6°F | 2.71 in | 78.9°F | 55.1°F | 2.99 in |
| October | 67.3°F | 43.9°F | 3.30 in | 66.8°F | 43.4°F | 3.02 in |
| November | 52.1°F | 33.0°F | 3.45 in | 52.3°F | 32.6°F | 3.11 in |
| December | 40.3°F | 24.5°F | 2.75 in | 40.5°F | 23.7°F | 2.33 in |
Cities that consider Sullivan their climate twin
These US cities have Sullivan in their top 3 most-similar list — meaning if you were to move from any of these places, Sullivan would feel familiar.
- Pearl, IL (ranks Sullivan #1)
- Florence, IL (ranks Sullivan #1)
- Avon, IN (ranks Sullivan #1)
- Brownsburg, IN (ranks Sullivan #1)
- Clermont, IN (ranks Sullivan #1)
- Speedway, IN (ranks Sullivan #1)
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 →