Climate twins of Portland, ME
These are the US cities whose 12-month climate pattern most closely matches Portland'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: Portland vs its climate twin
Top match: Fulton, NY
| Month | Portland | Fulton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 32.4°F | 15.6°F | 3.50 in | 31.1°F | 14.1°F | 3.78 in |
| February | 35.0°F | 17.3°F | 3.54 in | 33.0°F | 16.1°F | 3.65 in |
| March | 42.3°F | 26.0°F | 4.08 in | 41.3°F | 23.5°F | 3.46 in |
| April | 53.8°F | 35.4°F | 4.41 in | 55.3°F | 34.8°F | 3.91 in |
| May | 64.2°F | 45.5°F | 3.67 in | 68.7°F | 46.3°F | 3.80 in |
| June | 73.6°F | 55.0°F | 4.15 in | 77.2°F | 55.3°F | 3.60 in |
| July | 79.5°F | 61.2°F | 3.43 in | 81.4°F | 59.5°F | 3.93 in |
| August | 78.7°F | 59.7°F | 3.57 in | 79.9°F | 59.9°F | 4.02 in |
| September | 71.1°F | 52.1°F | 3.77 in | 72.0°F | 51.3°F | 3.49 in |
| October | 59.5°F | 41.0°F | 5.25 in | 59.0°F | 41.3°F | 4.66 in |
| November | 48.4°F | 31.7°F | 4.25 in | 48.0°F | 32.0°F | 3.96 in |
| December | 38.3°F | 22.4°F | 4.50 in | 36.6°F | 23.5°F | 4.43 in |
Cities that consider Portland their climate twin
These US cities have Portland in their top 3 most-similar list — meaning if you were to move from any of these places, Portland would feel familiar.
- East Hampton, NY (ranks Portland #3)
- North Haven, NY (ranks Portland #3)
- Sagaponack, NY (ranks Portland #3)
- Sag Harbor, NY (ranks Portland #3)
- Southampton, NY (ranks Portland #3)
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 →