Climate twins of Harristown, IL
These are the US cities whose 12-month climate pattern most closely matches Harristown'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: Harristown vs its climate twin
Top match: Hannibal, MO
| Month | Harristown | Hannibal | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 34.0°F | 19.7°F | 2.40 in | 34.6°F | 17.9°F | 2.11 in |
| February | 39.1°F | 23.5°F | 2.00 in | 39.6°F | 21.6°F | 2.25 in |
| March | 50.8°F | 32.8°F | 2.64 in | 51.4°F | 32.0°F | 2.76 in |
| April | 63.4°F | 43.3°F | 4.12 in | 63.7°F | 42.8°F | 4.33 in |
| May | 73.5°F | 53.8°F | 4.95 in | 73.3°F | 54.0°F | 4.96 in |
| June | 82.2°F | 63.1°F | 4.73 in | 82.1°F | 63.5°F | 4.91 in |
| July | 84.7°F | 66.5°F | 4.00 in | 85.7°F | 67.3°F | 4.11 in |
| August | 83.5°F | 64.9°F | 3.50 in | 84.4°F | 65.2°F | 3.92 in |
| September | 77.7°F | 57.0°F | 3.08 in | 77.9°F | 56.9°F | 3.53 in |
| October | 65.3°F | 45.7°F | 3.41 in | 65.7°F | 44.9°F | 3.39 in |
| November | 50.3°F | 34.3°F | 3.21 in | 51.5°F | 33.5°F | 2.82 in |
| December | 38.6°F | 25.0°F | 2.40 in | 39.3°F | 23.4°F | 2.19 in |
Cities that consider Harristown their climate twin
These US cities have Harristown in their top 3 most-similar list — meaning if you were to move from any of these places, Harristown would feel familiar.
- Hannibal, MO (ranks Harristown #1)
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 →