Climate twins of Waterloo, IA
These are the US cities whose 12-month climate pattern most closely matches Waterloo'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: Waterloo vs its climate twin
Top match: Brayton, IA
| Month | Waterloo | Brayton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 28.2°F | 10.7°F | 1.10 in | 31.2°F | 9.9°F | 0.86 in |
| February | 32.6°F | 15.2°F | 1.14 in | 36.1°F | 13.7°F | 1.14 in |
| March | 46.5°F | 26.9°F | 1.98 in | 50.0°F | 24.8°F | 1.89 in |
| April | 60.9°F | 37.9°F | 4.04 in | 62.7°F | 35.9°F | 3.81 in |
| May | 72.8°F | 50.2°F | 4.61 in | 73.1°F | 49.3°F | 5.43 in |
| June | 82.2°F | 60.8°F | 5.72 in | 82.8°F | 59.8°F | 5.74 in |
| July | 85.0°F | 64.0°F | 4.34 in | 86.1°F | 63.5°F | 4.40 in |
| August | 82.9°F | 61.0°F | 4.17 in | 84.4°F | 60.6°F | 4.44 in |
| September | 76.8°F | 52.4°F | 3.14 in | 78.2°F | 50.8°F | 3.35 in |
| October | 63.0°F | 40.2°F | 2.76 in | 65.0°F | 38.1°F | 2.93 in |
| November | 47.1°F | 27.7°F | 1.85 in | 49.2°F | 25.4°F | 1.65 in |
| December | 33.7°F | 17.0°F | 1.44 in | 36.3°F | 15.3°F | 1.50 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 →