Climate twins of Roscommon, MI
These are the US cities whose 12-month climate pattern most closely matches Roscommon'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: Roscommon vs its climate twin
Top match: Sister Bay, WI
| Month | Roscommon | Sister Bay | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 26.9°F | 11.4°F | 1.70 in | 26.7°F | 12.0°F | 1.71 in |
| February | 29.6°F | 11.0°F | 1.41 in | 29.1°F | 12.8°F | 1.06 in |
| March | 40.4°F | 19.1°F | 1.78 in | 38.6°F | 21.1°F | 1.66 in |
| April | 53.8°F | 30.7°F | 3.10 in | 51.0°F | 31.1°F | 2.71 in |
| May | 67.2°F | 42.3°F | 3.15 in | 64.5°F | 41.9°F | 3.46 in |
| June | 76.7°F | 51.1°F | 3.22 in | 73.8°F | 52.5°F | 3.31 in |
| July | 80.5°F | 55.0°F | 2.74 in | 79.6°F | 57.8°F | 3.05 in |
| August | 78.3°F | 53.3°F | 2.86 in | 78.3°F | 56.6°F | 3.03 in |
| September | 70.6°F | 46.1°F | 2.59 in | 70.3°F | 51.2°F | 3.41 in |
| October | 56.8°F | 36.8°F | 3.08 in | 57.1°F | 40.5°F | 3.61 in |
| November | 43.1°F | 27.9°F | 2.20 in | 43.5°F | 30.2°F | 2.27 in |
| December | 32.1°F | 19.0°F | 1.76 in | 32.5°F | 19.0°F | 1.70 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 →