Climate twins of Karnak, IL
These are the US cities whose 12-month climate pattern most closely matches Karnak'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: Karnak vs its climate twin
Top match: Marshall, AR
| Month | Karnak | Marshall | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 43.1°F | 26.2°F | 4.23 in | 47.2°F | 25.9°F | 3.20 in |
| February | 47.6°F | 29.7°F | 3.86 in | 51.8°F | 29.3°F | 3.33 in |
| March | 57.3°F | 36.8°F | 4.77 in | 60.5°F | 36.7°F | 4.83 in |
| April | 68.4°F | 46.6°F | 5.15 in | 69.9°F | 45.4°F | 5.32 in |
| May | 76.8°F | 56.4°F | 4.92 in | 76.8°F | 55.1°F | 5.06 in |
| June | 85.5°F | 64.8°F | 4.13 in | 84.8°F | 63.4°F | 3.68 in |
| July | 89.0°F | 68.7°F | 3.28 in | 89.2°F | 67.6°F | 3.48 in |
| August | 88.6°F | 67.2°F | 3.03 in | 89.0°F | 66.0°F | 3.16 in |
| September | 82.7°F | 60.2°F | 3.35 in | 82.0°F | 57.9°F | 3.67 in |
| October | 71.2°F | 48.4°F | 4.04 in | 71.6°F | 47.0°F | 3.80 in |
| November | 57.9°F | 38.6°F | 4.41 in | 59.8°F | 37.6°F | 4.35 in |
| December | 47.0°F | 30.8°F | 4.24 in | 50.0°F | 29.4°F | 3.59 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 →