Climate twins of Tracy, CA

These are the US cities whose 12-month climate pattern most closely matches Tracy'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
Perris, CA
similarity distance: 1.491 (lower = more similar)
Rank 2 closest
Moreno Valley, CA
similarity distance: 1.491 (lower = more similar)
Rank 3 closest
El Paso de Robles (Paso Robles), CA
similarity distance: 1.497 (lower = more similar)

Side-by-side: Tracy vs its climate twin

Top match: Perris, CA

Month Tracy Perris
High Low Precip High Low Precip
January 57.2°F 36.4°F 2.34 in 65.8°F 37.4°F 2.05 in
February 62.1°F 38.9°F 2.57 in 66.3°F 37.6°F 2.43 in
March 68.0°F 41.6°F 1.72 in 70.8°F 40.2°F 1.51 in
April 73.4°F 45.0°F 0.99 in 73.9°F 44.2°F 0.76 in
May 80.4°F 50.3°F 0.72 in 79.9°F 50.8°F 0.27 in
June 88.3°F 54.9°F 0.15 in 87.2°F 55.6°F 0.07 in
July 93.2°F 56.6°F 0.00 in 94.1°F 61.6°F 0.13 in
August 92.1°F 55.6°F 0.03 in 94.9°F 61.7°F 0.36 in
September 88.5°F 53.5°F 0.08 in 91.5°F 58.7°F 0.16 in
October 78.9°F 48.1°F 0.69 in 81.9°F 49.1°F 0.47 in
November 66.7°F 40.7°F 1.11 in 72.3°F 40.7°F 0.67 in
December 56.3°F 36.4°F 2.32 in 64.8°F 37.1°F 1.77 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 →