Climate twins of Sumas, WA

These are the US cities whose 12-month climate pattern most closely matches Sumas'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
Roy, WA
similarity distance: 1.552 (lower = more similar)
Rank 2 closest
Yacolt, WA
similarity distance: 1.876 (lower = more similar)
Rank 3 closest
Battle Ground, WA
similarity distance: 1.876 (lower = more similar)

Side-by-side: Sumas vs its climate twin

Top match: Roy, WA

Month Sumas Roy
High Low Precip High Low Precip
January 43.5°F 32.1°F 6.98 in 46.1°F 33.3°F 6.12 in
February 47.5°F 33.3°F 3.85 in 48.0°F 33.1°F 4.33 in
March 52.8°F 35.8°F 5.00 in 52.4°F 35.7°F 4.80 in
April 59.1°F 39.2°F 3.97 in 57.3°F 38.7°F 3.90 in
May 66.3°F 44.6°F 3.17 in 64.3°F 44.5°F 2.97 in
June 70.2°F 49.2°F 2.39 in 69.0°F 49.0°F 2.28 in
July 76.0°F 51.2°F 1.45 in 75.7°F 52.4°F 0.92 in
August 76.5°F 50.4°F 1.50 in 76.5°F 52.6°F 0.90 in
September 71.0°F 46.5°F 2.93 in 69.6°F 48.2°F 1.78 in
October 59.3°F 41.8°F 5.31 in 59.1°F 41.7°F 4.08 in
November 49.1°F 36.3°F 7.11 in 50.3°F 36.1°F 7.06 in
December 42.8°F 32.1°F 6.19 in 45.0°F 32.9°F 5.99 in

Cities that consider Sumas their climate twin

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