Climate twins of Union, IL
These are the US cities whose 12-month climate pattern most closely matches Union'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: Union vs its climate twin
Top match: Williamsburg, IA
| Month | Union | Williamsburg | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 29.2°F | 12.7°F | 1.67 in | 28.4°F | 10.4°F | 1.16 in |
| February | 33.2°F | 15.8°F | 1.64 in | 33.0°F | 14.3°F | 1.46 in |
| March | 44.9°F | 25.9°F | 2.08 in | 46.5°F | 25.8°F | 2.19 in |
| April | 58.6°F | 36.2°F | 3.81 in | 60.4°F | 36.4°F | 3.92 in |
| May | 70.2°F | 47.2°F | 4.57 in | 71.3°F | 48.9°F | 4.85 in |
| June | 79.9°F | 57.2°F | 4.62 in | 80.5°F | 59.4°F | 4.80 in |
| July | 83.5°F | 61.7°F | 4.05 in | 84.0°F | 62.6°F | 4.32 in |
| August | 81.8°F | 59.6°F | 4.22 in | 82.1°F | 59.7°F | 4.47 in |
| September | 75.4°F | 51.8°F | 3.68 in | 76.3°F | 50.7°F | 3.80 in |
| October | 62.4°F | 39.9°F | 2.98 in | 63.0°F | 38.6°F | 2.83 in |
| November | 46.9°F | 29.1°F | 2.35 in | 47.3°F | 26.9°F | 2.20 in |
| December | 34.5°F | 18.5°F | 1.94 in | 34.2°F | 16.3°F | 1.69 in |
Cities that consider Union their climate twin
These US cities have Union in their top 3 most-similar list — meaning if you were to move from any of these places, Union would feel familiar.
- Baldwin, IA (ranks Union #1)
- Delmar, IA (ranks Union #1)
- Maquoketa, IA (ranks Union #1)
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 →