Climate twins of St. Peters, MO
These are the US cities whose 12-month climate pattern most closely matches St. Peters'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: St. Peters vs its climate twin
Top match: Russellville, IL
| Month | St. Peters | Russellville | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 39.3°F | 21.2°F | 2.44 in | 39.4°F | 22.8°F | 3.16 in |
| February | 44.9°F | 24.8°F | 2.37 in | 44.2°F | 26.5°F | 2.16 in |
| March | 55.5°F | 33.3°F | 3.46 in | 55.1°F | 34.6°F | 3.16 in |
| April | 67.3°F | 43.3°F | 4.74 in | 67.3°F | 44.9°F | 4.24 in |
| May | 76.3°F | 53.5°F | 4.80 in | 76.8°F | 56.0°F | 4.85 in |
| June | 84.4°F | 63.3°F | 4.26 in | 85.3°F | 64.2°F | 4.38 in |
| July | 88.1°F | 67.5°F | 4.23 in | 87.6°F | 67.2°F | 4.22 in |
| August | 87.2°F | 65.4°F | 3.76 in | 86.8°F | 65.1°F | 2.94 in |
| September | 80.8°F | 57.1°F | 3.07 in | 81.6°F | 56.9°F | 2.94 in |
| October | 68.5°F | 45.2°F | 3.11 in | 69.4°F | 45.9°F | 3.51 in |
| November | 54.9°F | 35.0°F | 3.54 in | 54.6°F | 35.1°F | 3.44 in |
| December | 43.6°F | 26.5°F | 2.56 in | 43.4°F | 27.4°F | 2.66 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 →