Climate twins of Fairfield, IL
These are the US cities whose 12-month climate pattern most closely matches Fairfield'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: Fairfield vs its climate twin
Top match: Ghent, KY
| Month | Fairfield | Ghent | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 41.1°F | 24.5°F | 3.33 in | 41.3°F | 25.4°F | 3.61 in |
| February | 46.5°F | 27.9°F | 2.68 in | 46.1°F | 27.7°F | 3.01 in |
| March | 57.0°F | 36.3°F | 4.22 in | 56.6°F | 35.0°F | 4.42 in |
| April | 69.0°F | 46.5°F | 5.00 in | 69.1°F | 44.5°F | 4.54 in |
| May | 78.1°F | 55.9°F | 4.98 in | 77.8°F | 55.1°F | 4.94 in |
| June | 86.9°F | 64.3°F | 4.70 in | 84.6°F | 63.1°F | 5.18 in |
| July | 89.6°F | 67.8°F | 3.83 in | 88.5°F | 67.1°F | 4.21 in |
| August | 88.8°F | 65.6°F | 3.51 in | 87.6°F | 65.8°F | 3.79 in |
| September | 82.6°F | 57.9°F | 2.90 in | 81.4°F | 58.6°F | 3.31 in |
| October | 70.5°F | 47.0°F | 3.73 in | 69.4°F | 46.6°F | 3.42 in |
| November | 56.1°F | 36.3°F | 3.82 in | 55.9°F | 36.3°F | 3.85 in |
| December | 45.0°F | 28.8°F | 3.30 in | 44.9°F | 29.9°F | 4.20 in |
Cities that consider Fairfield their climate twin
These US cities have Fairfield in their top 3 most-similar list — meaning if you were to move from any of these places, Fairfield would feel familiar.
- Bridgeton, MO (ranks Fairfield #2)
- Champ, MO (ranks Fairfield #2)
- Hazelwood, MO (ranks Fairfield #2)
- Olivette, MO (ranks Fairfield #2)
- St. Ann, MO (ranks Fairfield #2)
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 →