Climate twins of Pontiac, IL
These are the US cities whose 12-month climate pattern most closely matches Pontiac'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: Pontiac vs its climate twin
Top match: Liberty, IL
| Month | Pontiac | Liberty | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.4°F | 17.2°F | 1.99 in | 34.6°F | 18.6°F | 1.57 in |
| February | 37.0°F | 20.5°F | 1.76 in | 39.7°F | 22.7°F | 1.77 in |
| March | 49.3°F | 30.0°F | 2.62 in | 51.7°F | 32.4°F | 2.29 in |
| April | 62.8°F | 40.6°F | 3.49 in | 63.7°F | 42.8°F | 3.98 in |
| May | 73.6°F | 52.1°F | 4.43 in | 73.3°F | 53.9°F | 4.55 in |
| June | 82.0°F | 62.1°F | 3.90 in | 82.4°F | 63.1°F | 4.50 in |
| July | 84.3°F | 65.7°F | 3.71 in | 86.0°F | 66.5°F | 3.49 in |
| August | 83.0°F | 63.6°F | 3.73 in | 84.5°F | 64.5°F | 3.93 in |
| September | 78.1°F | 55.7°F | 3.39 in | 77.9°F | 56.1°F | 3.09 in |
| October | 65.3°F | 43.8°F | 3.24 in | 65.3°F | 44.8°F | 3.05 in |
| November | 50.2°F | 32.5°F | 2.56 in | 51.2°F | 33.4°F | 2.41 in |
| December | 37.8°F | 22.7°F | 2.13 in | 39.3°F | 23.9°F | 1.80 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 →