Climate twins of El Cajon, CA

These are the US cities whose 12-month climate pattern most closely matches El Cajon'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
Isleton, CA
similarity distance: 1.476 (lower = more similar)
Rank 2 closest
Brentwood, CA
similarity distance: 1.476 (lower = more similar)
Rank 3 closest
Antioch, CA
similarity distance: 1.476 (lower = more similar)

Side-by-side: El Cajon vs its climate twin

Top match: Isleton, CA

Month El Cajon Isleton
High Low Precip High Low Precip
January 69.3°F 42.5°F 2.32 in 55.7°F 40.3°F 2.68 in
February 69.2°F 44.4°F 2.61 in 60.8°F 43.9°F 2.36 in
March 71.3°F 48.0°F 1.92 in 66.5°F 46.6°F 1.95 in
April 74.5°F 50.7°F 0.75 in 72.1°F 49.5°F 0.91 in
May 76.2°F 55.9°F 0.30 in 79.0°F 54.3°F 0.38 in
June 80.8°F 59.4°F 0.06 in 86.3°F 59.0°F 0.11 in
July 86.1°F 63.3°F 0.16 in 91.4°F 60.6°F 0.00 in
August 88.6°F 64.7°F 0.02 in 90.2°F 60.3°F 0.02 in
September 87.3°F 62.1°F 0.11 in 86.7°F 58.7°F 0.06 in
October 81.0°F 55.6°F 0.54 in 77.5°F 54.2°F 0.42 in
November 75.2°F 47.1°F 1.01 in 64.6°F 46.2°F 1.18 in
December 68.5°F 41.7°F 1.83 in 55.8°F 40.4°F 2.53 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 →