Climate twins of Sun Prairie, WI
These are the US cities whose 12-month climate pattern most closely matches Sun Prairie'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: Sun Prairie vs its climate twin
Top match: Earlville, IA
| Month | Sun Prairie | Earlville | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 27.0°F | 11.8°F | 1.47 in | 26.1°F | 8.2°F | 1.14 in |
| February | 31.2°F | 14.9°F | 1.52 in | 30.6°F | 12.0°F | 1.35 in |
| March | 43.6°F | 25.1°F | 2.26 in | 43.7°F | 23.8°F | 2.10 in |
| April | 56.9°F | 35.8°F | 3.78 in | 57.8°F | 34.8°F | 3.82 in |
| May | 69.0°F | 47.1°F | 4.10 in | 69.6°F | 46.9°F | 4.49 in |
| June | 78.6°F | 57.4°F | 5.28 in | 79.1°F | 57.6°F | 6.02 in |
| July | 82.1°F | 61.6°F | 4.51 in | 82.1°F | 61.0°F | 4.79 in |
| August | 79.9°F | 59.5°F | 4.16 in | 80.4°F | 58.1°F | 4.13 in |
| September | 72.9°F | 51.0°F | 3.43 in | 74.1°F | 49.0°F | 3.84 in |
| October | 59.6°F | 39.8°F | 2.77 in | 61.0°F | 37.4°F | 3.11 in |
| November | 44.8°F | 28.7°F | 2.22 in | 45.1°F | 25.7°F | 2.20 in |
| December | 32.3°F | 18.2°F | 1.63 in | 32.0°F | 15.2°F | 1.58 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 →