Climate twins of Rancho Cucamonga, CA
These are the US cities whose 12-month climate pattern most closely matches Rancho Cucamonga'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: Rancho Cucamonga vs its climate twin
Top match: Newman, CA
| Month | Rancho Cucamonga | Newman | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 67.7°F | 44.6°F | 2.57 in | 60.1°F | 38.2°F | 2.66 in |
| February | 68.1°F | 46.2°F | 3.07 in | 66.6°F | 40.8°F | 2.23 in |
| March | 71.7°F | 48.7°F | 1.64 in | 73.0°F | 43.6°F | 1.76 in |
| April | 75.7°F | 51.1°F | 0.76 in | 79.7°F | 46.3°F | 0.71 in |
| May | 79.8°F | 55.6°F | 0.30 in | 88.0°F | 52.1°F | 0.45 in |
| June | 86.4°F | 60.0°F | 0.02 in | 95.7°F | 57.5°F | 0.07 in |
| July | 93.8°F | 64.7°F | 0.05 in | 100.0°F | 61.6°F | 0.00 in |
| August | 94.9°F | 65.2°F | 0.03 in | 98.2°F | 60.4°F | 0.00 in |
| September | 91.3°F | 63.8°F | 0.10 in | 94.9°F | 57.3°F | 0.04 in |
| October | 82.6°F | 57.1°F | 0.41 in | 85.1°F | 50.0°F | 0.59 in |
| November | 74.7°F | 49.0°F | 0.80 in | 70.7°F | 42.4°F | 1.06 in |
| December | 66.9°F | 43.6°F | 1.89 in | 60.4°F | 37.8°F | 2.14 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 →