Climate twins of Iroquois, IL
These are the US cities whose 12-month climate pattern most closely matches Iroquois'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: Iroquois vs its climate twin
Top match: Zanesville, IN
| Month | Iroquois | Zanesville | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.7°F | 15.5°F | 2.07 in | 32.6°F | 18.4°F | 2.54 in |
| February | 37.4°F | 18.4°F | 1.98 in | 36.5°F | 21.0°F | 2.06 in |
| March | 49.6°F | 28.5°F | 2.42 in | 47.8°F | 29.4°F | 2.81 in |
| April | 62.3°F | 38.3°F | 3.65 in | 60.9°F | 39.4°F | 3.74 in |
| May | 73.5°F | 50.2°F | 4.41 in | 72.2°F | 50.4°F | 4.58 in |
| June | 82.1°F | 59.8°F | 5.02 in | 81.0°F | 60.3°F | 4.48 in |
| July | 84.8°F | 62.7°F | 4.20 in | 84.1°F | 63.5°F | 4.05 in |
| August | 83.2°F | 60.0°F | 3.50 in | 82.0°F | 61.2°F | 3.80 in |
| September | 78.7°F | 52.2°F | 3.19 in | 76.1°F | 53.4°F | 3.04 in |
| October | 65.9°F | 41.3°F | 3.24 in | 63.7°F | 42.8°F | 2.95 in |
| November | 50.7°F | 30.9°F | 2.65 in | 49.4°F | 32.8°F | 2.96 in |
| December | 38.0°F | 21.4°F | 2.10 in | 37.5°F | 24.2°F | 2.47 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 →