Climate twins of Walnut Hill, IL

These are the US cities whose 12-month climate pattern most closely matches Walnut Hill'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: Walnut Hill vs its climate twin

Top match: Marthasville, MO

Month Walnut Hill Marthasville
High Low Precip High Low Precip
January 38.8°F 20.9°F 2.87 in 39.9°F 20.2°F 2.52 in
February 44.0°F 24.3°F 2.58 in 45.4°F 23.4°F 2.52 in
March 54.2°F 33.0°F 3.90 in 55.8°F 32.1°F 3.66 in
April 66.2°F 43.6°F 4.81 in 67.3°F 42.8°F 4.57 in
May 75.2°F 53.5°F 5.20 in 75.8°F 54.2°F 5.30 in
June 84.1°F 62.3°F 4.08 in 83.8°F 63.6°F 4.20 in
July 87.5°F 65.8°F 3.85 in 88.3°F 67.0°F 4.19 in
August 86.9°F 63.7°F 3.54 in 86.9°F 64.9°F 3.75 in
September 81.0°F 55.8°F 3.29 in 79.5°F 55.9°F 3.71 in
October 69.3°F 44.7°F 3.45 in 68.9°F 43.6°F 3.37 in
November 54.9°F 34.2°F 4.09 in 55.3°F 32.8°F 3.67 in
December 43.2°F 25.5°F 3.02 in 44.5°F 24.3°F 2.64 in

Cities that consider Walnut Hill their climate twin

These US cities have Walnut Hill in their top 3 most-similar list — meaning if you were to move from any of these places, Walnut Hill would feel familiar.

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 →