Climate twins of Grundy Center, IA
These are the US cities whose 12-month climate pattern most closely matches Grundy Center'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: Grundy Center vs its climate twin
Top match: Newell, IA
| Month | Grundy Center | Newell | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 26.1°F | 8.7°F | 0.83 in | 25.8°F | 8.8°F | 0.77 in |
| February | 30.7°F | 12.7°F | 0.98 in | 30.2°F | 13.3°F | 1.01 in |
| March | 44.1°F | 24.3°F | 1.88 in | 43.4°F | 25.1°F | 1.74 in |
| April | 58.7°F | 35.5°F | 3.88 in | 58.1°F | 36.9°F | 3.53 in |
| May | 70.4°F | 48.3°F | 4.89 in | 69.1°F | 49.4°F | 4.87 in |
| June | 80.0°F | 59.5°F | 5.65 in | 79.2°F | 60.2°F | 5.33 in |
| July | 82.9°F | 62.4°F | 4.43 in | 82.3°F | 63.7°F | 3.83 in |
| August | 80.9°F | 59.6°F | 4.80 in | 79.9°F | 61.4°F | 4.43 in |
| September | 75.1°F | 50.6°F | 3.28 in | 74.1°F | 52.6°F | 2.96 in |
| October | 61.9°F | 38.4°F | 2.88 in | 60.6°F | 39.6°F | 2.42 in |
| November | 45.4°F | 26.2°F | 1.88 in | 44.3°F | 26.6°F | 1.75 in |
| December | 32.1°F | 15.1°F | 1.44 in | 31.1°F | 15.3°F | 1.11 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 →