Climate twins of Seneca, IL
These are the US cities whose 12-month climate pattern most closely matches Seneca'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: Seneca vs its climate twin
Top match: Roseville, IL
| Month | Seneca | Roseville | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 31.4°F | 14.2°F | 1.95 in | 30.8°F | 13.0°F | 1.83 in |
| February | 35.4°F | 17.2°F | 1.90 in | 35.5°F | 16.6°F | 1.84 in |
| March | 47.5°F | 27.2°F | 2.54 in | 48.4°F | 26.3°F | 2.38 in |
| April | 61.2°F | 37.3°F | 3.59 in | 61.8°F | 37.0°F | 3.62 in |
| May | 72.6°F | 48.5°F | 4.70 in | 72.3°F | 49.1°F | 4.95 in |
| June | 81.1°F | 58.1°F | 4.92 in | 80.5°F | 59.0°F | 4.38 in |
| July | 84.0°F | 61.9°F | 3.85 in | 83.7°F | 62.3°F | 4.23 in |
| August | 82.4°F | 60.5°F | 4.09 in | 82.3°F | 59.8°F | 3.67 in |
| September | 77.1°F | 52.9°F | 3.46 in | 76.8°F | 51.0°F | 3.65 in |
| October | 64.1°F | 41.2°F | 3.20 in | 64.2°F | 39.8°F | 2.85 in |
| November | 49.1°F | 30.0°F | 2.72 in | 49.4°F | 28.5°F | 2.37 in |
| December | 36.6°F | 20.5°F | 2.11 in | 36.4°F | 19.5°F | 1.86 in |
Cities that consider Seneca their climate twin
These US cities have Seneca in their top 3 most-similar list — meaning if you were to move from any of these places, Seneca would feel familiar.
- Monmouth, IL (ranks Seneca #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 →