Climate twins of Montclair, CA
These are the US cities whose 12-month climate pattern most closely matches Montclair'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.
Side-by-side: Montclair vs its climate twin
Top match: Stockton, CA
| Month | Montclair | Stockton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 67.9°F | 43.1°F | 2.91 in | 58.2°F | 39.3°F | 3.57 in |
| February | 67.3°F | 44.5°F | 4.15 in | 64.5°F | 42.2°F | 3.13 in |
| March | 72.0°F | 47.0°F | 2.12 in | 70.0°F | 45.6°F | 2.36 in |
| April | 75.8°F | 49.6°F | 0.97 in | 75.0°F | 49.4°F | 1.45 in |
| May | 78.4°F | 54.0°F | 0.22 in | 83.1°F | 54.2°F | 0.57 in |
| June | 84.3°F | 57.2°F | 0.06 in | 90.5°F | 58.2°F | 0.13 in |
| July | 90.3°F | 62.3°F | 0.00 in | 94.7°F | 61.0°F | 0.00 in |
| August | 92.4°F | 62.7°F | 0.03 in | 94.9°F | 59.8°F | 0.02 in |
| September | 88.7°F | 60.4°F | 0.01 in | 91.9°F | 57.1°F | 0.08 in |
| October | 80.5°F | 53.9°F | 0.97 in | 81.8°F | 50.9°F | 1.01 in |
| November | 73.5°F | 47.0°F | 0.74 in | 68.8°F | 43.7°F | 1.82 in |
| December | 66.9°F | 41.5°F | 2.29 in | 58.7°F | 39.0°F | 3.15 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 →