Climate twins of Piedmont, SD
These are the US cities whose 12-month climate pattern most closely matches Piedmont'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: Piedmont vs its climate twin
Top match: Gillette, WY
| Month | Piedmont | Gillette | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 36.9°F | 13.2°F | 0.24 in | 36.2°F | 15.8°F | 0.59 in |
| February | 37.8°F | 14.5°F | 0.44 in | 37.6°F | 16.8°F | 0.78 in |
| March | 46.7°F | 22.6°F | 0.88 in | 48.7°F | 24.8°F | 1.13 in |
| April | 54.4°F | 31.0°F | 1.99 in | 56.4°F | 31.7°F | 2.13 in |
| May | 64.4°F | 41.6°F | 3.73 in | 65.9°F | 41.0°F | 3.27 in |
| June | 75.4°F | 51.6°F | 2.95 in | 77.0°F | 50.2°F | 2.54 in |
| July | 83.6°F | 58.2°F | 2.68 in | 86.4°F | 57.0°F | 1.68 in |
| August | 82.7°F | 56.3°F | 1.97 in | 85.4°F | 55.7°F | 1.38 in |
| September | 73.9°F | 46.9°F | 1.48 in | 75.3°F | 46.4°F | 1.25 in |
| October | 59.3°F | 34.9°F | 1.60 in | 59.2°F | 34.4°F | 1.57 in |
| November | 47.3°F | 23.5°F | 0.51 in | 46.2°F | 24.1°F | 0.63 in |
| December | 38.6°F | 15.4°F | 0.31 in | 35.8°F | 16.1°F | 0.64 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 →