Climate twins of Tacoma, WA
These are the US cities whose 12-month climate pattern most closely matches Tacoma'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: Tacoma vs its climate twin
Top match: Dayton, OR
| Month | Tacoma | Dayton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 48.1°F | 37.4°F | 6.03 in | 47.3°F | 35.2°F | 5.51 in |
| February | 50.3°F | 37.4°F | 4.03 in | 51.0°F | 35.3°F | 4.08 in |
| March | 54.7°F | 40.1°F | 4.38 in | 55.7°F | 37.1°F | 4.17 in |
| April | 59.8°F | 43.7°F | 3.39 in | 60.5°F | 39.7°F | 2.99 in |
| May | 66.5°F | 49.1°F | 2.00 in | 68.0°F | 44.3°F | 1.99 in |
| June | 71.1°F | 53.4°F | 1.42 in | 73.7°F | 48.3°F | 1.32 in |
| July | 76.8°F | 57.2°F | 0.55 in | 82.7°F | 51.9°F | 0.25 in |
| August | 76.9°F | 57.0°F | 0.83 in | 83.1°F | 51.9°F | 0.36 in |
| September | 70.7°F | 53.0°F | 1.57 in | 77.0°F | 48.2°F | 1.30 in |
| October | 60.7°F | 46.6°F | 4.09 in | 64.0°F | 42.3°F | 3.48 in |
| November | 52.4°F | 40.5°F | 6.50 in | 52.6°F | 37.9°F | 5.74 in |
| December | 47.3°F | 36.9°F | 6.02 in | 46.5°F | 34.4°F | 6.45 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 →