Climate twins of Silvis, IL
These are the US cities whose 12-month climate pattern most closely matches Silvis'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: Silvis vs its climate twin
Top match: Johnston, IA
| Month | Silvis | Johnston | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 30.5°F | 14.1°F | 1.51 in | 30.0°F | 13.1°F | 1.01 in |
| February | 34.7°F | 17.7°F | 1.64 in | 35.1°F | 17.3°F | 1.25 in |
| March | 47.1°F | 28.4°F | 2.57 in | 48.6°F | 28.8°F | 2.15 in |
| April | 60.6°F | 39.8°F | 3.77 in | 61.5°F | 40.1°F | 4.00 in |
| May | 72.0°F | 51.7°F | 4.81 in | 71.8°F | 51.8°F | 4.84 in |
| June | 81.5°F | 62.3°F | 4.61 in | 80.9°F | 62.0°F | 5.35 in |
| July | 85.0°F | 66.1°F | 4.17 in | 84.7°F | 65.6°F | 4.27 in |
| August | 83.0°F | 64.1°F | 4.06 in | 82.9°F | 63.6°F | 3.97 in |
| September | 76.6°F | 56.0°F | 3.35 in | 76.2°F | 55.1°F | 3.40 in |
| October | 63.6°F | 43.8°F | 2.60 in | 63.1°F | 42.5°F | 2.51 in |
| November | 48.4°F | 31.4°F | 2.14 in | 47.7°F | 29.9°F | 1.95 in |
| December | 35.7°F | 20.5°F | 1.89 in | 35.2°F | 19.0°F | 1.46 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 →