Climate twins of Mount Vernon, IL
These are the US cities whose 12-month climate pattern most closely matches Mount Vernon'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: Mount Vernon vs its climate twin
Top match: Edgar Springs, MO
| Month | Mount Vernon | Edgar Springs | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 38.5°F | 21.7°F | 2.60 in | 42.5°F | 21.0°F | 2.58 in |
| February | 43.6°F | 25.0°F | 2.62 in | 47.4°F | 24.4°F | 2.75 in |
| March | 53.6°F | 33.8°F | 4.00 in | 57.9°F | 32.0°F | 3.88 in |
| April | 64.9°F | 44.1°F | 4.96 in | 67.8°F | 42.2°F | 4.71 in |
| May | 73.8°F | 55.0°F | 5.06 in | 75.4°F | 50.9°F | 5.31 in |
| June | 82.4°F | 63.7°F | 4.84 in | 82.8°F | 59.9°F | 4.14 in |
| July | 85.7°F | 67.3°F | 3.78 in | 87.4°F | 63.1°F | 3.68 in |
| August | 84.8°F | 64.8°F | 3.33 in | 86.4°F | 61.0°F | 3.64 in |
| September | 78.6°F | 56.7°F | 3.37 in | 79.5°F | 52.7°F | 3.36 in |
| October | 67.5°F | 44.7°F | 3.53 in | 69.2°F | 41.6°F | 3.45 in |
| November | 53.7°F | 34.2°F | 3.99 in | 56.1°F | 32.5°F | 3.95 in |
| December | 42.9°F | 26.1°F | 2.89 in | 45.5°F | 24.2°F | 2.56 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 →