Climate twins of Charleston, SC
These are the US cities whose 12-month climate pattern most closely matches Charleston'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: Charleston vs its climate twin
Top match: St. Marys, GA
| Month | Charleston | St. Marys | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 58.0°F | 43.6°F | 2.56 in | 62.3°F | 42.9°F | 2.83 in |
| February | 60.3°F | 46.1°F | 2.56 in | 64.9°F | 45.3°F | 2.82 in |
| March | 65.6°F | 52.0°F | 3.03 in | 69.9°F | 50.8°F | 3.31 in |
| April | 72.3°F | 59.7°F | 2.96 in | 75.6°F | 57.0°F | 2.77 in |
| May | 79.0°F | 68.0°F | 2.58 in | 82.0°F | 65.1°F | 3.71 in |
| June | 84.3°F | 74.2°F | 4.85 in | 86.4°F | 71.4°F | 6.29 in |
| July | 87.5°F | 77.1°F | 5.08 in | 88.8°F | 73.5°F | 4.58 in |
| August | 86.4°F | 76.5°F | 6.11 in | 88.5°F | 73.7°F | 6.53 in |
| September | 82.6°F | 72.5°F | 5.25 in | 84.7°F | 71.0°F | 5.20 in |
| October | 75.6°F | 63.2°F | 4.07 in | 78.9°F | 61.6°F | 4.39 in |
| November | 67.1°F | 53.1°F | 2.30 in | 70.5°F | 51.5°F | 1.68 in |
| December | 60.9°F | 46.8°F | 2.91 in | 64.8°F | 45.7°F | 3.06 in |
Cities that consider Charleston their climate twin
These US cities have Charleston in their top 3 most-similar list — meaning if you were to move from any of these places, Charleston would feel familiar.
- St. Marys, GA (ranks Charleston #1)
- Fernandina Beach, FL (ranks Charleston #3)
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 →