Climate twins of Duvall, WA
These are the US cities whose 12-month climate pattern most closely matches Duvall'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: Duvall vs its climate twin
Top match: Westfir, OR
| Month | Duvall | Westfir | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 44.0°F | 32.1°F | 6.54 in | 43.8°F | 31.4°F | 6.23 in |
| February | 47.6°F | 32.1°F | 4.47 in | 49.2°F | 32.2°F | 4.57 in |
| March | 52.0°F | 34.8°F | 5.22 in | 54.5°F | 34.1°F | 5.01 in |
| April | 57.4°F | 38.6°F | 4.30 in | 59.3°F | 37.4°F | 4.26 in |
| May | 63.9°F | 44.0°F | 3.42 in | 65.8°F | 42.6°F | 3.23 in |
| June | 68.0°F | 48.6°F | 2.69 in | 71.2°F | 47.0°F | 1.95 in |
| July | 74.2°F | 51.8°F | 1.15 in | 80.0°F | 50.7°F | 0.53 in |
| August | 74.7°F | 51.5°F | 1.30 in | 81.0°F | 50.0°F | 0.56 in |
| September | 68.7°F | 47.6°F | 2.73 in | 75.8°F | 45.5°F | 1.58 in |
| October | 57.7°F | 41.2°F | 5.03 in | 62.8°F | 39.9°F | 3.63 in |
| November | 48.5°F | 35.3°F | 7.16 in | 49.0°F | 35.2°F | 6.66 in |
| December | 42.7°F | 31.5°F | 6.76 in | 42.4°F | 31.6°F | 7.54 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 →