Climate twins of Carpentersville, IL
These are the US cities whose 12-month climate pattern most closely matches Carpentersville'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: Carpentersville vs its climate twin
Top match: Roseville, IL
| Month | Carpentersville | Roseville | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 30.1°F | 14.1°F | 2.02 in | 30.8°F | 13.0°F | 1.83 in |
| February | 34.2°F | 16.8°F | 1.87 in | 35.5°F | 16.6°F | 1.84 in |
| March | 46.1°F | 26.3°F | 2.37 in | 48.4°F | 26.3°F | 2.38 in |
| April | 58.7°F | 37.0°F | 3.96 in | 61.8°F | 37.0°F | 3.62 in |
| May | 70.3°F | 48.3°F | 5.12 in | 72.3°F | 49.1°F | 4.95 in |
| June | 80.1°F | 58.4°F | 4.46 in | 80.5°F | 59.0°F | 4.38 in |
| July | 84.1°F | 63.2°F | 3.98 in | 83.7°F | 62.3°F | 4.23 in |
| August | 82.3°F | 61.2°F | 4.33 in | 82.3°F | 59.8°F | 3.67 in |
| September | 75.7°F | 52.8°F | 3.53 in | 76.8°F | 51.0°F | 3.65 in |
| October | 62.7°F | 40.9°F | 3.31 in | 64.2°F | 39.8°F | 2.85 in |
| November | 47.6°F | 30.1°F | 2.68 in | 49.4°F | 28.5°F | 2.37 in |
| December | 35.5°F | 20.1°F | 2.22 in | 36.4°F | 19.5°F | 1.86 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 →