Climate twins of Charles City, IA
These are the US cities whose 12-month climate pattern most closely matches Charles City'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: Charles City vs its climate twin
Top match: Montfort, WI
| Month | Charles City | Montfort | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 24.6°F | 8.6°F | 1.01 in | 25.7°F | 9.9°F | 1.22 in |
| February | 29.5°F | 12.6°F | 1.14 in | 30.8°F | 13.7°F | 1.47 in |
| March | 43.1°F | 25.3°F | 1.93 in | 43.3°F | 24.8°F | 2.09 in |
| April | 58.1°F | 36.7°F | 3.73 in | 57.1°F | 35.4°F | 3.95 in |
| May | 69.5°F | 48.5°F | 5.06 in | 68.7°F | 47.1°F | 4.65 in |
| June | 78.8°F | 58.6°F | 6.13 in | 78.2°F | 58.3°F | 5.97 in |
| July | 82.0°F | 62.1°F | 4.92 in | 81.8°F | 61.8°F | 5.29 in |
| August | 79.6°F | 59.7°F | 4.28 in | 80.1°F | 59.8°F | 4.23 in |
| September | 73.4°F | 51.3°F | 3.82 in | 73.2°F | 51.2°F | 4.25 in |
| October | 60.3°F | 38.8°F | 2.58 in | 60.3°F | 39.1°F | 2.82 in |
| November | 43.7°F | 26.3°F | 1.74 in | 44.6°F | 28.0°F | 2.25 in |
| December | 29.8°F | 15.1°F | 1.38 in | 31.6°F | 16.7°F | 1.79 in |
Cities that consider Charles City their climate twin
These US cities have Charles City in their top 3 most-similar list — meaning if you were to move from any of these places, Charles City would feel familiar.
- Montfort, WI (ranks Charles City #3)
- Belmont, WI (ranks Charles City #3)
- Platteville, WI (ranks Charles City #3)
- Rewey, WI (ranks Charles City #3)
- Livingston, WI (ranks Charles City #3)
- Richland Center, WI (ranks Charles City #3)
- Boaz, WI (ranks Charles City #3)
- Muscoda, WI (ranks Charles City #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 →