Climate twins of Holyoke, MA
These are the US cities whose 12-month climate pattern most closely matches Holyoke'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: Holyoke vs its climate twin
Top match: Sunbury, PA
| Month | Holyoke | Sunbury | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 34.8°F | 15.5°F | 2.75 in | 35.3°F | 18.9°F | 2.98 in |
| February | 37.9°F | 17.3°F | 2.60 in | 39.0°F | 20.6°F | 2.30 in |
| March | 46.6°F | 25.7°F | 3.43 in | 47.7°F | 27.4°F | 3.33 in |
| April | 60.3°F | 35.4°F | 4.06 in | 61.1°F | 37.2°F | 3.74 in |
| May | 71.6°F | 46.2°F | 3.71 in | 71.7°F | 47.2°F | 3.77 in |
| June | 79.7°F | 55.1°F | 4.37 in | 79.8°F | 56.8°F | 4.38 in |
| July | 84.9°F | 60.9°F | 4.15 in | 84.4°F | 60.3°F | 4.32 in |
| August | 82.9°F | 59.1°F | 3.72 in | 82.2°F | 59.2°F | 3.93 in |
| September | 75.3°F | 50.9°F | 4.60 in | 75.1°F | 51.2°F | 4.52 in |
| October | 63.0°F | 39.4°F | 4.72 in | 63.6°F | 40.4°F | 3.92 in |
| November | 50.8°F | 30.2°F | 3.47 in | 50.8°F | 31.8°F | 3.16 in |
| December | 39.8°F | 22.1°F | 3.58 in | 40.1°F | 24.6°F | 3.34 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 →