Climate twins of Avon, SD
These are the US cities whose 12-month climate pattern most closely matches Avon'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: Avon vs its climate twin
Top match: Royal, IA
| Month | Avon | Royal | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 28.9°F | 8.7°F | 0.57 in | 25.8°F | 8.1°F | 0.25 in |
| February | 34.0°F | 12.5°F | 0.81 in | 30.3°F | 12.6°F | 0.43 in |
| March | 45.9°F | 23.1°F | 1.35 in | 43.6°F | 24.8°F | 1.44 in |
| April | 58.2°F | 34.3°F | 2.86 in | 58.9°F | 35.5°F | 2.82 in |
| May | 69.9°F | 47.0°F | 3.96 in | 70.9°F | 47.9°F | 3.83 in |
| June | 80.6°F | 58.3°F | 3.39 in | 80.9°F | 58.7°F | 4.01 in |
| July | 85.8°F | 62.9°F | 3.33 in | 84.5°F | 62.3°F | 3.84 in |
| August | 83.4°F | 60.3°F | 3.27 in | 81.9°F | 59.2°F | 3.29 in |
| September | 76.1°F | 50.6°F | 2.70 in | 75.8°F | 50.2°F | 3.21 in |
| October | 61.7°F | 36.7°F | 2.21 in | 61.3°F | 37.4°F | 2.22 in |
| November | 45.8°F | 23.7°F | 1.01 in | 44.6°F | 24.7°F | 1.07 in |
| December | 32.7°F | 13.5°F | 0.78 in | 30.7°F | 13.6°F | 0.42 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 →