Climate twins of Ontario, OR

These are the US cities whose 12-month climate pattern most closely matches Ontario'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
Twin Falls, ID
similarity distance: 0.754 (lower = more similar)
Rank 2 closest
Bridgeport, WA
similarity distance: 0.774 (lower = more similar)
Rank 3 closest
Brewster, WA
similarity distance: 0.774 (lower = more similar)

Side-by-side: Ontario vs its climate twin

Top match: Twin Falls, ID

Month Ontario Twin Falls
High Low Precip High Low Precip
January 35.8°F 22.7°F 1.30 in 40.4°F 22.4°F 1.04 in
February 43.6°F 25.9°F 0.79 in 45.6°F 24.7°F 0.78 in
March 55.7°F 32.0°F 1.00 in 55.9°F 31.9°F 0.87 in
April 63.2°F 37.8°F 0.87 in 62.6°F 35.8°F 1.02 in
May 73.6°F 46.7°F 1.41 in 72.7°F 44.8°F 1.22 in
June 82.3°F 54.1°F 0.68 in 81.0°F 51.7°F 0.67 in
July 93.4°F 60.1°F 0.25 in 92.1°F 58.3°F 0.16 in
August 91.4°F 57.0°F 0.10 in 90.5°F 55.5°F 0.34 in
September 80.9°F 47.3°F 0.34 in 79.9°F 47.4°F 0.33 in
October 64.6°F 36.0°F 0.77 in 66.9°F 37.0°F 0.70 in
November 47.3°F 27.6°F 0.90 in 50.7°F 28.0°F 0.76 in
December 36.3°F 22.3°F 1.58 in 39.6°F 22.6°F 1.31 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 →