Climate twins of Keystone, SD
These are the US cities whose 12-month climate pattern most closely matches Keystone'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: Keystone vs its climate twin
Top match: Kilgore, NE
| Month | Keystone | Kilgore | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 36.8°F | 18.8°F | 0.48 in | 33.1°F | 11.4°F | 0.77 in |
| February | 36.3°F | 18.4°F | 0.76 in | 36.5°F | 13.3°F | 0.87 in |
| March | 44.2°F | 25.4°F | 1.35 in | 47.1°F | 21.7°F | 1.47 in |
| April | 50.2°F | 31.8°F | 2.62 in | 56.3°F | 31.0°F | 2.96 in |
| May | 59.6°F | 41.5°F | 4.80 in | 66.9°F | 42.4°F | 3.37 in |
| June | 71.1°F | 51.9°F | 3.58 in | 77.8°F | 53.1°F | 3.51 in |
| July | 78.7°F | 59.1°F | 3.59 in | 84.7°F | 58.7°F | 2.64 in |
| August | 77.5°F | 58.0°F | 2.29 in | 84.0°F | 55.9°F | 2.31 in |
| September | 69.1°F | 49.6°F | 1.76 in | 75.4°F | 45.9°F | 1.81 in |
| October | 55.0°F | 36.8°F | 1.80 in | 60.7°F | 33.3°F | 1.41 in |
| November | 44.4°F | 27.0°F | 0.59 in | 46.2°F | 22.1°F | 0.74 in |
| December | 36.6°F | 19.8°F | 0.50 in | 35.3°F | 13.5°F | 0.78 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 →