Climate twins of Harrisburg, OR
These are the US cities whose 12-month climate pattern most closely matches Harrisburg'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: Harrisburg vs its climate twin
Top match: Chehalis, WA
| Month | Harrisburg | Chehalis | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 48.1°F | 34.7°F | 6.05 in | 46.1°F | 34.2°F | 5.85 in |
| February | 51.5°F | 35.0°F | 4.67 in | 49.5°F | 33.9°F | 4.24 in |
| March | 56.6°F | 37.2°F | 4.64 in | 54.1°F | 35.9°F | 4.39 in |
| April | 61.3°F | 40.0°F | 3.32 in | 59.5°F | 39.1°F | 3.24 in |
| May | 68.1°F | 44.0°F | 2.46 in | 66.6°F | 44.4°F | 2.44 in |
| June | 74.2°F | 47.6°F | 1.23 in | 71.1°F | 49.1°F | 1.53 in |
| July | 84.0°F | 51.7°F | 0.32 in | 77.5°F | 52.9°F | 0.50 in |
| August | 84.3°F | 51.5°F | 0.39 in | 78.2°F | 52.8°F | 0.84 in |
| September | 78.0°F | 47.8°F | 1.39 in | 72.6°F | 48.4°F | 1.59 in |
| October | 64.9°F | 41.8°F | 3.17 in | 61.1°F | 42.7°F | 4.00 in |
| November | 53.2°F | 37.7°F | 5.98 in | 50.7°F | 37.1°F | 6.53 in |
| December | 46.8°F | 34.3°F | 7.21 in | 45.0°F | 33.9°F | 6.44 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 →