Climate twins of Etna, CA
These are the US cities whose 12-month climate pattern most closely matches Etna'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: Etna vs its climate twin
Top match: Waitsburg, WA
| Month | Etna | Waitsburg | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 47.6°F | 27.7°F | 3.48 in | 41.5°F | 26.4°F | 2.08 in |
| February | 52.7°F | 29.7°F | 2.80 in | 46.2°F | 28.2°F | 1.72 in |
| March | 58.7°F | 32.1°F | 2.38 in | 53.9°F | 33.0°F | 2.24 in |
| April | 64.5°F | 35.1°F | 1.37 in | 61.1°F | 37.8°F | 1.86 in |
| May | 73.0°F | 40.3°F | 1.55 in | 69.9°F | 44.5°F | 1.80 in |
| June | 81.1°F | 44.9°F | 0.69 in | 76.8°F | 49.9°F | 1.24 in |
| July | 90.0°F | 50.7°F | 0.47 in | 87.6°F | 54.9°F | 0.39 in |
| August | 89.0°F | 49.0°F | 0.29 in | 86.7°F | 54.2°F | 0.45 in |
| September | 82.6°F | 43.3°F | 0.38 in | 77.2°F | 47.2°F | 0.73 in |
| October | 69.5°F | 36.4°F | 1.34 in | 62.9°F | 38.0°F | 1.54 in |
| November | 54.1°F | 31.4°F | 2.27 in | 49.3°F | 31.0°F | 2.43 in |
| December | 46.0°F | 27.6°F | 3.75 in | 40.7°F | 26.5°F | 2.31 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 →