Climate twins of Sac City, IA
These are the US cities whose 12-month climate pattern most closely matches Sac 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: Sac City vs its climate twin
Top match: Arcadia, WI
| Month | Sac City | Arcadia | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 26.4°F | 7.8°F | 0.73 in | 27.1°F | 7.8°F | 0.95 in |
| February | 31.1°F | 11.8°F | 0.96 in | 32.4°F | 12.4°F | 1.05 in |
| March | 44.4°F | 23.5°F | 1.82 in | 45.5°F | 23.5°F | 1.93 in |
| April | 58.9°F | 34.5°F | 3.48 in | 59.7°F | 35.5°F | 3.72 in |
| May | 70.1°F | 46.9°F | 4.59 in | 71.5°F | 46.5°F | 4.30 in |
| June | 80.1°F | 57.8°F | 5.14 in | 79.6°F | 56.9°F | 4.99 in |
| July | 83.2°F | 61.7°F | 3.89 in | 83.5°F | 60.5°F | 3.80 in |
| August | 80.9°F | 58.9°F | 4.43 in | 80.9°F | 58.3°F | 4.32 in |
| September | 75.1°F | 49.7°F | 2.85 in | 74.3°F | 50.8°F | 3.50 in |
| October | 61.8°F | 37.2°F | 2.42 in | 60.9°F | 38.8°F | 2.72 in |
| November | 45.1°F | 24.4°F | 1.57 in | 44.6°F | 26.7°F | 1.74 in |
| December | 31.7°F | 14.0°F | 1.17 in | 32.2°F | 14.5°F | 1.37 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 →