Climate twins of Greenfield, MA
These are the US cities whose 12-month climate pattern most closely matches Greenfield'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: Greenfield vs its climate twin
Top match: Port Jervis, NY
| Month | Greenfield | Port Jervis | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 33.3°F | 14.6°F | 3.52 in | 33.9°F | 16.0°F | 3.07 in |
| February | 37.4°F | 13.6°F | 3.09 in | 37.3°F | 17.0°F | 2.63 in |
| March | 45.3°F | 23.3°F | 3.93 in | 46.2°F | 24.5°F | 3.66 in |
| April | 58.5°F | 34.3°F | 3.80 in | 60.1°F | 34.7°F | 3.78 in |
| May | 69.6°F | 45.2°F | 3.98 in | 71.3°F | 45.6°F | 3.58 in |
| June | 78.1°F | 53.9°F | 4.84 in | 78.8°F | 55.0°F | 4.72 in |
| July | 82.7°F | 59.3°F | 4.06 in | 83.6°F | 60.0°F | 4.72 in |
| August | 81.1°F | 57.3°F | 4.67 in | 81.4°F | 58.3°F | 4.64 in |
| September | 74.1°F | 50.3°F | 4.24 in | 73.8°F | 51.0°F | 4.54 in |
| October | 62.0°F | 38.9°F | 4.73 in | 61.8°F | 39.6°F | 4.67 in |
| November | 49.6°F | 29.1°F | 3.80 in | 49.4°F | 30.1°F | 3.27 in |
| December | 39.5°F | 20.7°F | 4.73 in | 38.5°F | 22.2°F | 3.90 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 →