Climate twins of Allentown, PA
These are the US cities whose 12-month climate pattern most closely matches Allentown'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: Allentown vs its climate twin
Top match: La Plata, MD
| Month | Allentown | La Plata | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 38.4°F | 21.8°F | 3.30 in | 44.2°F | 24.8°F | 3.29 in |
| February | 41.6°F | 23.2°F | 2.77 in | 47.6°F | 26.2°F | 2.97 in |
| March | 50.8°F | 30.5°F | 3.63 in | 55.9°F | 32.6°F | 4.24 in |
| April | 63.4°F | 40.3°F | 3.67 in | 67.3°F | 42.5°F | 3.31 in |
| May | 73.5°F | 50.6°F | 3.65 in | 73.7°F | 52.0°F | 4.32 in |
| June | 81.9°F | 59.9°F | 4.40 in | 81.5°F | 60.9°F | 4.19 in |
| July | 86.4°F | 64.7°F | 5.30 in | 85.3°F | 65.9°F | 4.57 in |
| August | 84.3°F | 62.8°F | 4.56 in | 83.3°F | 64.2°F | 4.84 in |
| September | 77.4°F | 55.2°F | 4.84 in | 76.7°F | 57.7°F | 4.87 in |
| October | 65.5°F | 43.8°F | 4.14 in | 66.1°F | 45.7°F | 4.18 in |
| November | 53.8°F | 34.1°F | 3.24 in | 57.3°F | 35.5°F | 3.34 in |
| December | 43.1°F | 26.8°F | 3.86 in | 48.1°F | 28.6°F | 3.99 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 →