Climate twins of Roslyn, WA
These are the US cities whose 12-month climate pattern most closely matches Roslyn'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: Roslyn vs its climate twin
Top match: Vernonia, OR
| Month | Roslyn | Vernonia | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 35.5°F | 24.6°F | 8.13 in | 45.7°F | 31.6°F | 6.94 in |
| February | 40.1°F | 25.4°F | 5.84 in | 49.4°F | 30.9°F | 5.34 in |
| March | 46.0°F | 28.7°F | 4.94 in | 53.6°F | 33.5°F | 5.30 in |
| April | 52.5°F | 32.5°F | 3.42 in | 58.6°F | 35.6°F | 3.74 in |
| May | 61.0°F | 39.0°F | 2.21 in | 65.5°F | 40.3°F | 2.39 in |
| June | 66.9°F | 45.1°F | 1.77 in | 69.9°F | 44.4°F | 1.44 in |
| July | 75.5°F | 50.5°F | 0.71 in | 77.3°F | 47.2°F | 0.39 in |
| August | 76.1°F | 49.8°F | 0.87 in | 78.2°F | 46.9°F | 0.55 in |
| September | 69.0°F | 43.3°F | 1.88 in | 73.1°F | 42.9°F | 1.79 in |
| October | 56.0°F | 35.2°F | 4.93 in | 61.4°F | 38.3°F | 4.12 in |
| November | 42.5°F | 29.4°F | 7.77 in | 50.6°F | 34.2°F | 7.70 in |
| December | 35.2°F | 25.0°F | 7.37 in | 44.3°F | 31.3°F | 8.33 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 →