Climate twins of Defiance, IA
These are the US cities whose 12-month climate pattern most closely matches Defiance'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: Defiance vs its climate twin
Top match: Lambs Grove, IA
| Month | Defiance | Lambs Grove | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 30.7°F | 10.3°F | 0.90 in | 28.0°F | 10.4°F | 0.93 in |
| February | 35.7°F | 13.7°F | 0.98 in | 33.0°F | 14.4°F | 1.10 in |
| March | 49.9°F | 25.3°F | 2.05 in | 46.4°F | 25.8°F | 2.06 in |
| April | 63.3°F | 36.4°F | 3.34 in | 60.4°F | 37.1°F | 3.44 in |
| May | 74.1°F | 49.3°F | 4.74 in | 71.4°F | 49.8°F | 4.84 in |
| June | 83.6°F | 59.9°F | 5.17 in | 81.2°F | 60.0°F | 5.01 in |
| July | 85.9°F | 63.6°F | 3.72 in | 84.6°F | 63.8°F | 3.93 in |
| August | 84.0°F | 60.8°F | 4.32 in | 82.5°F | 61.4°F | 4.30 in |
| September | 78.5°F | 51.7°F | 4.00 in | 76.2°F | 52.4°F | 3.59 in |
| October | 65.4°F | 39.1°F | 2.37 in | 62.5°F | 40.4°F | 2.66 in |
| November | 49.3°F | 25.9°F | 1.43 in | 46.7°F | 27.3°F | 2.01 in |
| December | 35.9°F | 15.7°F | 1.31 in | 33.6°F | 16.9°F | 1.27 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 →