Climate twins of Portland, TN
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: Greenfield, TN
| Month | Portland | Greenfield | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 45.3°F | 26.6°F | 4.20 in | 45.7°F | 27.1°F | 3.88 in |
| February | 50.3°F | 29.5°F | 4.69 in | 50.4°F | 30.3°F | 4.80 in |
| March | 59.1°F | 37.0°F | 5.08 in | 59.5°F | 38.2°F | 4.84 in |
| April | 69.8°F | 46.5°F | 5.24 in | 69.9°F | 47.3°F | 5.08 in |
| May | 77.7°F | 56.6°F | 5.80 in | 77.7°F | 57.2°F | 5.91 in |
| June | 85.3°F | 64.8°F | 4.36 in | 85.3°F | 65.4°F | 4.61 in |
| July | 88.8°F | 68.5°F | 4.57 in | 88.2°F | 69.3°F | 4.45 in |
| August | 88.1°F | 66.9°F | 4.15 in | 88.1°F | 67.5°F | 3.19 in |
| September | 82.2°F | 59.6°F | 3.64 in | 82.3°F | 60.3°F | 3.89 in |
| October | 71.4°F | 47.9°F | 3.69 in | 71.5°F | 48.0°F | 3.64 in |
| November | 58.9°F | 37.4°F | 3.78 in | 58.8°F | 38.0°F | 4.31 in |
| December | 48.9°F | 30.2°F | 5.11 in | 48.8°F | 30.5°F | 4.96 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.
- Martin, TN (ranks Portland #1)
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 →