Climate twins of Donnelly, MN
These are the US cities whose 12-month climate pattern most closely matches Donnelly'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: Donnelly vs its climate twin
Top match: Ironton, MN
| Month | Donnelly | Ironton | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 19.2°F | 0.5°F | 0.72 in | 21.4°F | -0.1°F | 0.47 in |
| February | 23.5°F | 4.1°F | 0.74 in | 26.8°F | 4.1°F | 0.36 in |
| March | 36.4°F | 18.2°F | 1.20 in | 39.8°F | 17.5°F | 0.97 in |
| April | 52.9°F | 31.9°F | 2.24 in | 54.5°F | 30.5°F | 1.60 in |
| May | 67.5°F | 45.2°F | 3.10 in | 67.9°F | 42.7°F | 3.27 in |
| June | 77.1°F | 56.4°F | 4.38 in | 77.1°F | 53.2°F | 4.03 in |
| July | 80.7°F | 59.9°F | 4.25 in | 81.5°F | 57.7°F | 4.35 in |
| August | 78.9°F | 56.9°F | 3.46 in | 79.2°F | 55.3°F | 3.06 in |
| September | 71.9°F | 47.9°F | 2.68 in | 70.5°F | 46.9°F | 2.60 in |
| October | 56.5°F | 34.6°F | 2.44 in | 55.6°F | 35.2°F | 2.37 in |
| November | 39.0°F | 21.0°F | 0.99 in | 39.5°F | 21.6°F | 0.90 in |
| December | 25.0°F | 8.1°F | 0.75 in | 26.0°F | 7.6°F | 0.55 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 →