Climate twins of Friday Harbor, WA
These are the US cities whose 12-month climate pattern most closely matches Friday Harbor'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: Friday Harbor vs its climate twin
Top match: Colton, WA
| Month | Friday Harbor | Colton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 47.1°F | 37.1°F | 2.69 in | 37.6°F | 27.8°F | 2.15 in |
| February | 48.5°F | 36.5°F | 1.54 in | 41.6°F | 29.2°F | 1.59 in |
| March | 52.6°F | 38.4°F | 1.35 in | 49.3°F | 32.9°F | 1.95 in |
| April | 57.4°F | 40.7°F | 1.01 in | 56.4°F | 37.2°F | 1.79 in |
| May | 63.7°F | 44.3°F | 1.14 in | 65.4°F | 43.7°F | 1.41 in |
| June | 68.4°F | 48.1°F | 0.75 in | 71.9°F | 47.7°F | 1.17 in |
| July | 72.4°F | 50.0°F | 0.48 in | 83.1°F | 50.9°F | 0.39 in |
| August | 73.3°F | 50.0°F | 0.70 in | 83.4°F | 50.4°F | 0.49 in |
| September | 68.1°F | 47.9°F | 1.04 in | 74.2°F | 45.4°F | 0.65 in |
| October | 58.5°F | 44.0°F | 2.34 in | 59.2°F | 37.6°F | 1.59 in |
| November | 51.0°F | 39.8°F | 2.98 in | 44.7°F | 32.5°F | 2.14 in |
| December | 46.3°F | 36.8°F | 2.45 in | 36.6°F | 26.9°F | 2.21 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 →