Climate twins of Royal, IA

These are the US cities whose 12-month climate pattern most closely matches Royal'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.

Rank 1 closest
Howard, SD
similarity distance: 0.605 (lower = more similar)
Rank 2 closest
Carthage, SD
similarity distance: 0.605 (lower = more similar)
Rank 3 closest
Canova, SD
similarity distance: 0.605 (lower = more similar)

Side-by-side: Royal vs its climate twin

Top match: Howard, SD

Month Royal Howard
High Low Precip High Low Precip
January 25.8°F 8.1°F 0.25 in 29.1°F 4.6°F 0.63 in
February 30.3°F 12.6°F 0.43 in 34.1°F 9.0°F 0.67 in
March 43.6°F 24.8°F 1.44 in 46.8°F 20.8°F 1.37 in
April 58.9°F 35.5°F 2.82 in 61.0°F 31.8°F 2.68 in
May 70.9°F 47.9°F 3.83 in 72.5°F 44.8°F 3.88 in
June 80.9°F 58.7°F 4.01 in 82.3°F 55.8°F 3.70 in
July 84.5°F 62.3°F 3.84 in 87.3°F 60.2°F 3.51 in
August 81.9°F 59.2°F 3.29 in 84.9°F 57.6°F 2.89 in
September 75.8°F 50.2°F 3.21 in 77.4°F 48.4°F 2.96 in
October 61.3°F 37.4°F 2.22 in 62.6°F 35.1°F 2.35 in
November 44.6°F 24.7°F 1.07 in 46.9°F 21.3°F 1.02 in
December 30.7°F 13.6°F 0.42 in 33.1°F 10.2°F 0.69 in

Cities that consider Royal their climate twin

These US cities have Royal in their top 3 most-similar list — meaning if you were to move from any of these places, Royal 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 →