Climate twins of Helena, OK
These are the US cities whose 12-month climate pattern most closely matches Helena'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: Helena vs its climate twin
Top match: Solomon, KS
| Month | Helena | Solomon | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 46.8°F | 23.3°F | 1.04 in | 43.2°F | 21.7°F | 0.86 in |
| February | 51.0°F | 26.5°F | 1.25 in | 48.6°F | 25.2°F | 1.43 in |
| March | 61.0°F | 35.5°F | 2.22 in | 59.7°F | 34.9°F | 2.23 in |
| April | 70.2°F | 44.2°F | 3.27 in | 69.7°F | 44.7°F | 3.26 in |
| May | 79.5°F | 55.7°F | 4.37 in | 78.9°F | 54.7°F | 5.20 in |
| June | 89.7°F | 65.8°F | 4.42 in | 89.4°F | 64.8°F | 4.18 in |
| July | 95.0°F | 70.3°F | 3.22 in | 94.4°F | 69.4°F | 4.75 in |
| August | 93.2°F | 68.7°F | 3.71 in | 92.1°F | 67.4°F | 4.27 in |
| September | 85.3°F | 60.6°F | 2.56 in | 84.2°F | 58.9°F | 2.54 in |
| October | 72.7°F | 47.5°F | 3.03 in | 71.2°F | 46.4°F | 2.47 in |
| November | 59.1°F | 35.0°F | 1.60 in | 57.1°F | 34.1°F | 1.59 in |
| December | 48.1°F | 26.0°F | 1.45 in | 45.4°F | 24.5°F | 1.50 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 →