Climate twins of Chicago Heights, IL
These are the US cities whose 12-month climate pattern most closely matches Chicago Heights'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: Chicago Heights vs its climate twin
Top match: Markle, IN
| Month | Chicago Heights | Markle | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 31.1°F | 15.2°F | 2.49 in | 33.3°F | 17.0°F | 2.49 in |
| February | 35.2°F | 18.4°F | 2.15 in | 37.0°F | 18.7°F | 2.18 in |
| March | 46.4°F | 28.1°F | 2.65 in | 48.0°F | 26.9°F | 2.66 in |
| April | 59.3°F | 38.3°F | 4.02 in | 61.4°F | 37.1°F | 3.95 in |
| May | 70.6°F | 49.3°F | 4.57 in | 72.6°F | 48.2°F | 4.71 in |
| June | 80.2°F | 58.9°F | 4.91 in | 81.1°F | 58.3°F | 4.61 in |
| July | 83.9°F | 63.8°F | 4.73 in | 84.4°F | 61.7°F | 4.48 in |
| August | 82.0°F | 62.0°F | 4.02 in | 82.6°F | 59.6°F | 3.66 in |
| September | 75.8°F | 54.6°F | 3.44 in | 76.8°F | 51.6°F | 3.25 in |
| October | 63.1°F | 42.4°F | 3.65 in | 64.2°F | 40.3°F | 3.00 in |
| November | 48.2°F | 31.4°F | 3.00 in | 50.0°F | 31.0°F | 3.25 in |
| December | 36.3°F | 21.5°F | 2.47 in | 38.2°F | 22.7°F | 2.38 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 →