Climate twins of San Juan, TX
These are the US cities whose 12-month climate pattern most closely matches San Juan'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: San Juan vs its climate twin
Top match: Cotulla, TX
| Month | San Juan | Cotulla | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 72.8°F | 52.7°F | 0.77 in | 67.4°F | 43.9°F | 0.85 in |
| February | 77.4°F | 56.9°F | 0.72 in | 73.6°F | 48.3°F | 1.26 in |
| March | 83.2°F | 62.7°F | 1.38 in | 79.7°F | 54.8°F | 1.57 in |
| April | 88.4°F | 68.4°F | 1.43 in | 86.0°F | 60.7°F | 1.33 in |
| May | 93.1°F | 74.1°F | 2.03 in | 92.8°F | 68.6°F | 3.01 in |
| June | 97.4°F | 78.0°F | 3.05 in | 97.9°F | 73.6°F | 2.20 in |
| July | 98.5°F | 78.8°F | 2.03 in | 99.2°F | 74.7°F | 2.26 in |
| August | 99.6°F | 78.9°F | 1.81 in | 100.3°F | 75.0°F | 1.67 in |
| September | 94.3°F | 75.6°F | 4.61 in | 93.9°F | 70.8°F | 2.98 in |
| October | 89.3°F | 68.7°F | 2.10 in | 86.6°F | 62.8°F | 2.39 in |
| November | 80.2°F | 60.1°F | 1.17 in | 75.7°F | 52.4°F | 1.15 in |
| December | 73.8°F | 54.1°F | 1.06 in | 68.7°F | 44.9°F | 1.01 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 →