Climate twins of Vacaville, CA
These are the US cities whose 12-month climate pattern most closely matches Vacaville'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: Vacaville vs its climate twin
Top match: South Pasadena, CA
| Month | Vacaville | South Pasadena | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 57.6°F | 37.7°F | 5.26 in | 68.1°F | 45.5°F | 4.51 in |
| February | 62.6°F | 40.3°F | 5.06 in | 69.3°F | 46.1°F | 5.16 in |
| March | 67.7°F | 43.0°F | 3.69 in | 72.6°F | 48.4°F | 3.03 in |
| April | 72.8°F | 45.8°F | 1.29 in | 76.2°F | 50.6°F | 1.11 in |
| May | 81.0°F | 51.1°F | 0.81 in | 78.3°F | 53.9°F | 0.48 in |
| June | 89.5°F | 56.4°F | 0.17 in | 83.7°F | 57.8°F | 0.21 in |
| July | 95.0°F | 59.0°F | 0.01 in | 89.1°F | 62.0°F | 0.06 in |
| August | 93.8°F | 57.9°F | 0.02 in | 91.3°F | 63.2°F | 0.03 in |
| September | 90.6°F | 55.6°F | 0.06 in | 89.9°F | 61.6°F | 0.22 in |
| October | 79.9°F | 49.1°F | 1.08 in | 83.0°F | 56.3°F | 0.84 in |
| November | 66.5°F | 41.5°F | 2.31 in | 74.7°F | 49.6°F | 1.10 in |
| December | 57.8°F | 37.1°F | 5.08 in | 67.2°F | 44.7°F | 3.33 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 →