Climate twins of Coupeville, WA

These are the US cities whose 12-month climate pattern most closely matches Coupeville'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
Colton, WA
similarity distance: 2.211 (lower = more similar)
Rank 2 closest
Garfield, WA
similarity distance: 2.234 (lower = more similar)
Rank 3 closest
Farmington, WA
similarity distance: 2.234 (lower = more similar)

Side-by-side: Coupeville vs its climate twin

Top match: Colton, WA

Month Coupeville Colton
High Low Precip High Low Precip
January 44.2°F 36.6°F 2.50 in 37.6°F 27.8°F 2.15 in
February 46.7°F 36.2°F 1.91 in 41.6°F 29.2°F 1.59 in
March 50.9°F 38.4°F 1.96 in 49.3°F 32.9°F 1.95 in
April 56.5°F 41.7°F 1.87 in 56.4°F 37.2°F 1.79 in
May 61.7°F 46.6°F 1.73 in 65.4°F 43.7°F 1.41 in
June 65.2°F 50.2°F 1.31 in 71.9°F 47.7°F 1.17 in
July 70.1°F 52.7°F 0.78 in 83.1°F 50.9°F 0.39 in
August 70.5°F 52.7°F 0.70 in 83.4°F 50.4°F 0.49 in
September 65.8°F 49.4°F 1.22 in 74.2°F 45.4°F 0.65 in
October 56.4°F 44.5°F 2.08 in 59.2°F 37.6°F 1.59 in
November 48.6°F 39.6°F 3.12 in 44.7°F 32.5°F 2.14 in
December 43.6°F 36.2°F 2.56 in 36.6°F 26.9°F 2.21 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 →