Climate twins of Plymouth, IA
These are the US cities whose 12-month climate pattern most closely matches Plymouth'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: Plymouth vs its climate twin
Top match: West Salem, WI
| Month | Plymouth | West Salem | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 24.0°F | 7.0°F | 0.89 in | 23.6°F | 8.3°F | 1.12 in |
| February | 28.6°F | 10.9°F | 1.07 in | 28.7°F | 12.8°F | 1.13 in |
| March | 41.3°F | 23.0°F | 1.95 in | 41.1°F | 24.4°F | 1.93 in |
| April | 56.4°F | 34.7°F | 3.91 in | 55.4°F | 36.1°F | 4.02 in |
| May | 68.6°F | 46.9°F | 5.58 in | 67.2°F | 47.9°F | 4.91 in |
| June | 78.7°F | 57.6°F | 5.70 in | 76.0°F | 57.8°F | 5.29 in |
| July | 81.9°F | 61.5°F | 4.63 in | 79.5°F | 61.8°F | 4.26 in |
| August | 79.6°F | 58.8°F | 3.71 in | 78.1°F | 60.3°F | 4.47 in |
| September | 73.5°F | 50.1°F | 3.24 in | 70.8°F | 52.0°F | 4.00 in |
| October | 60.1°F | 37.6°F | 2.55 in | 57.6°F | 39.9°F | 2.91 in |
| November | 43.3°F | 25.2°F | 1.79 in | 41.7°F | 27.7°F | 1.94 in |
| December | 29.9°F | 14.2°F | 1.25 in | 29.2°F | 15.4°F | 1.49 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 →