Climate twins of Vernon Hills, IL
These are the US cities whose 12-month climate pattern most closely matches Vernon Hills'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: Vernon Hills vs its climate twin
Top match: Morrison, IL
| Month | Vernon Hills | Morrison | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 28.9°F | 13.5°F | 1.76 in | 28.9°F | 12.0°F | 1.51 in |
| February | 32.9°F | 16.3°F | 1.93 in | 33.6°F | 15.7°F | 1.65 in |
| March | 44.2°F | 25.8°F | 2.49 in | 46.2°F | 26.7°F | 2.53 in |
| April | 56.5°F | 36.0°F | 3.95 in | 59.5°F | 36.9°F | 3.84 in |
| May | 68.0°F | 47.4°F | 4.57 in | 70.8°F | 48.8°F | 4.73 in |
| June | 77.9°F | 57.8°F | 4.38 in | 79.9°F | 58.6°F | 4.93 in |
| July | 82.1°F | 62.3°F | 4.01 in | 83.1°F | 62.0°F | 4.16 in |
| August | 80.7°F | 60.9°F | 4.19 in | 81.1°F | 59.7°F | 4.32 in |
| September | 73.7°F | 52.8°F | 3.38 in | 75.0°F | 51.2°F | 3.35 in |
| October | 60.8°F | 41.5°F | 3.20 in | 62.2°F | 39.4°F | 2.77 in |
| November | 46.6°F | 30.1°F | 2.47 in | 47.2°F | 28.4°F | 2.47 in |
| December | 34.2°F | 19.6°F | 2.12 in | 34.5°F | 18.3°F | 2.02 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 →