Climate twins of Iona, MN
These are the US cities whose 12-month climate pattern most closely matches Iona'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: Iona vs its climate twin
Top match: New Auburn, WI
| Month | Iona | New Auburn | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 21.3°F | 3.9°F | 0.61 in | 21.3°F | 3.4°F | 1.00 in |
| February | 26.1°F | 8.1°F | 0.91 in | 26.4°F | 6.5°F | 0.94 in |
| March | 38.4°F | 20.0°F | 1.62 in | 39.1°F | 19.4°F | 1.58 in |
| April | 53.6°F | 31.9°F | 2.95 in | 54.2°F | 32.7°F | 2.93 in |
| May | 66.5°F | 44.9°F | 4.02 in | 67.7°F | 45.4°F | 3.73 in |
| June | 77.3°F | 55.6°F | 4.97 in | 77.2°F | 55.6°F | 4.51 in |
| July | 81.1°F | 59.8°F | 3.62 in | 81.4°F | 59.6°F | 4.14 in |
| August | 78.5°F | 57.0°F | 3.40 in | 79.1°F | 57.0°F | 3.98 in |
| September | 71.5°F | 48.2°F | 3.24 in | 71.0°F | 48.4°F | 3.32 in |
| October | 57.3°F | 34.9°F | 2.26 in | 56.4°F | 35.6°F | 2.82 in |
| November | 40.4°F | 21.8°F | 1.70 in | 40.3°F | 23.9°F | 1.74 in |
| December | 26.4°F | 10.2°F | 0.84 in | 27.0°F | 11.2°F | 1.22 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 →