Climate twins of Fairfax, IA
These are the US cities whose 12-month climate pattern most closely matches Fairfax'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: Fairfax vs its climate twin
Top match: Lake Mills, WI
| Month | Fairfax | Lake Mills | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 27.9°F | 11.3°F | 0.95 in | 26.8°F | 11.4°F | 1.41 in |
| February | 32.6°F | 15.5°F | 1.22 in | 31.1°F | 14.1°F | 1.52 in |
| March | 46.3°F | 26.8°F | 1.99 in | 43.2°F | 24.6°F | 2.03 in |
| April | 60.1°F | 37.6°F | 3.56 in | 57.0°F | 35.9°F | 3.59 in |
| May | 71.1°F | 49.5°F | 4.25 in | 69.5°F | 47.7°F | 4.39 in |
| June | 80.1°F | 59.7°F | 5.56 in | 79.8°F | 58.4°F | 5.11 in |
| July | 82.8°F | 62.7°F | 4.41 in | 83.5°F | 62.4°F | 4.37 in |
| August | 81.2°F | 60.4°F | 4.07 in | 81.0°F | 60.6°F | 4.50 in |
| September | 74.7°F | 51.9°F | 3.40 in | 74.0°F | 51.7°F | 3.47 in |
| October | 61.5°F | 39.9°F | 2.91 in | 60.8°F | 40.2°F | 2.82 in |
| November | 46.2°F | 27.7°F | 2.00 in | 45.2°F | 28.5°F | 2.12 in |
| December | 33.3°F | 17.1°F | 1.59 in | 32.3°F | 18.0°F | 1.65 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 →