Climate twins of Castalia, IA
These are the US cities whose 12-month climate pattern most closely matches Castalia'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: Castalia vs its climate twin
Top match: Portage, WI
| Month | Castalia | Portage | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 25.7°F | 7.4°F | 1.12 in | 26.1°F | 9.9°F | 1.44 in |
| February | 29.9°F | 10.5°F | 1.21 in | 30.6°F | 13.2°F | 1.41 in |
| March | 43.0°F | 22.4°F | 2.09 in | 42.4°F | 24.0°F | 2.18 in |
| April | 57.5°F | 34.0°F | 4.14 in | 55.7°F | 35.8°F | 4.15 in |
| May | 69.4°F | 46.9°F | 4.99 in | 68.2°F | 47.8°F | 4.58 in |
| June | 79.0°F | 57.8°F | 5.88 in | 77.9°F | 57.9°F | 5.61 in |
| July | 82.8°F | 60.9°F | 4.52 in | 81.6°F | 61.6°F | 4.51 in |
| August | 80.8°F | 58.2°F | 4.36 in | 79.9°F | 59.4°F | 4.12 in |
| September | 74.0°F | 49.2°F | 3.96 in | 72.6°F | 50.7°F | 3.56 in |
| October | 60.6°F | 37.0°F | 3.00 in | 59.3°F | 39.0°F | 2.86 in |
| November | 44.7°F | 25.5°F | 2.10 in | 44.2°F | 28.3°F | 2.22 in |
| December | 31.4°F | 14.0°F | 1.57 in | 31.8°F | 17.1°F | 1.68 in |
Cities that consider Castalia their climate twin
These US cities have Castalia in their top 3 most-similar list — meaning if you were to move from any of these places, Castalia would feel familiar.
- Verona, WI (ranks Castalia #3)
- Kamrar, IA (ranks Castalia #3)
- Lehigh, IA (ranks Castalia #3)
- Duncombe, IA (ranks Castalia #3)
- Woolstock, IA (ranks Castalia #3)
- Webster City, IA (ranks Castalia #3)
- Belleville, WI (ranks Castalia #3)
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 →