Climate twins of John Day, OR
These are the US cities whose 12-month climate pattern most closely matches John Day'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: John Day vs its climate twin
Top match: Merrill, OR
| Month | John Day | Merrill | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 40.3°F | 21.2°F | 1.09 in | 42.4°F | 21.4°F | 1.32 in |
| February | 44.8°F | 22.6°F | 0.60 in | 47.2°F | 22.5°F | 1.14 in |
| March | 51.5°F | 26.4°F | 1.14 in | 53.4°F | 25.8°F | 1.20 in |
| April | 57.3°F | 30.3°F | 1.49 in | 59.2°F | 29.6°F | 0.99 in |
| May | 66.4°F | 37.1°F | 1.83 in | 68.9°F | 37.1°F | 1.11 in |
| June | 74.5°F | 42.7°F | 1.30 in | 76.8°F | 42.2°F | 0.80 in |
| July | 86.2°F | 47.8°F | 0.43 in | 86.3°F | 47.2°F | 0.21 in |
| August | 85.8°F | 46.1°F | 0.50 in | 85.5°F | 44.4°F | 0.25 in |
| September | 76.7°F | 39.1°F | 0.52 in | 79.0°F | 37.8°F | 0.37 in |
| October | 62.2°F | 31.1°F | 1.04 in | 65.8°F | 30.3°F | 0.72 in |
| November | 47.5°F | 25.6°F | 1.19 in | 49.8°F | 25.0°F | 1.14 in |
| December | 39.0°F | 20.8°F | 1.14 in | 40.8°F | 20.2°F | 1.45 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 →