Climate twins of Princeton, IL
These are the US cities whose 12-month climate pattern most closely matches Princeton'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: Princeton vs its climate twin
Top match: Fairfield, IA
| Month | Princeton | Fairfield | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 30.3°F | 13.8°F | 1.96 in | 30.6°F | 13.6°F | 1.52 in |
| February | 35.0°F | 17.6°F | 2.00 in | 35.6°F | 17.7°F | 1.80 in |
| March | 47.9°F | 27.6°F | 2.52 in | 48.5°F | 28.1°F | 2.40 in |
| April | 61.5°F | 38.1°F | 4.03 in | 61.9°F | 38.8°F | 3.71 in |
| May | 72.6°F | 49.8°F | 5.07 in | 71.3°F | 49.8°F | 5.51 in |
| June | 81.7°F | 59.5°F | 4.64 in | 80.5°F | 59.5°F | 5.11 in |
| July | 84.5°F | 63.2°F | 3.66 in | 84.2°F | 63.5°F | 3.96 in |
| August | 82.3°F | 61.1°F | 4.02 in | 82.6°F | 61.3°F | 3.83 in |
| September | 76.1°F | 53.0°F | 3.90 in | 76.1°F | 52.8°F | 3.58 in |
| October | 63.0°F | 41.5°F | 3.14 in | 62.8°F | 41.3°F | 3.00 in |
| November | 47.9°F | 29.7°F | 2.61 in | 47.8°F | 29.7°F | 2.28 in |
| December | 35.4°F | 19.6°F | 2.24 in | 35.4°F | 19.7°F | 1.72 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 →