Climate twins of Calumet Park, IL
These are the US cities whose 12-month climate pattern most closely matches Calumet Park'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: Calumet Park vs its climate twin
Top match: Havana, IL
| Month | Calumet Park | Havana | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.8°F | 19.5°F | 2.30 in | 33.5°F | 16.4°F | 2.20 in |
| February | 36.8°F | 22.9°F | 2.12 in | 38.8°F | 20.4°F | 2.18 in |
| March | 47.9°F | 32.0°F | 2.66 in | 51.2°F | 30.2°F | 2.72 in |
| April | 60.0°F | 41.7°F | 4.15 in | 63.8°F | 40.9°F | 4.22 in |
| May | 71.5°F | 52.4°F | 4.75 in | 74.5°F | 52.8°F | 5.08 in |
| June | 81.2°F | 62.7°F | 4.53 in | 84.6°F | 61.6°F | 4.73 in |
| July | 85.2°F | 68.1°F | 4.02 in | 88.1°F | 65.1°F | 4.18 in |
| August | 83.1°F | 66.9°F | 4.10 in | 86.0°F | 62.9°F | 4.02 in |
| September | 76.5°F | 59.2°F | 3.33 in | 80.4°F | 53.5°F | 3.26 in |
| October | 63.7°F | 46.8°F | 3.86 in | 67.8°F | 42.0°F | 3.37 in |
| November | 49.6°F | 35.2°F | 2.73 in | 52.4°F | 31.8°F | 2.73 in |
| December | 37.7°F | 25.3°F | 2.33 in | 39.1°F | 21.8°F | 2.35 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 →