Climate twins of Half Moon Bay, CA
These are the US cities whose 12-month climate pattern most closely matches Half Moon Bay'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: Half Moon Bay vs its climate twin
Top match: Pismo Beach, CA
| Month | Half Moon Bay | Pismo Beach | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 59.4°F | 43.4°F | 5.07 in | 64.8°F | 44.2°F | 3.48 in |
| February | 59.5°F | 43.0°F | 4.73 in | 65.1°F | 44.0°F | 4.00 in |
| March | 60.4°F | 43.7°F | 3.67 in | 67.5°F | 46.2°F | 2.98 in |
| April | 61.0°F | 44.7°F | 1.81 in | 69.7°F | 48.2°F | 1.00 in |
| May | 61.7°F | 48.0°F | 0.96 in | 72.3°F | 49.5°F | 0.46 in |
| June | 63.9°F | 49.9°F | 0.36 in | 70.5°F | 51.4°F | 0.15 in |
| July | 64.8°F | 52.7°F | 0.14 in | 70.3°F | 53.9°F | 0.02 in |
| August | 65.6°F | 53.9°F | 0.23 in | 71.4°F | 54.8°F | 0.02 in |
| September | 66.4°F | 51.3°F | 0.21 in | 71.9°F | 53.6°F | 0.08 in |
| October | 66.4°F | 47.9°F | 1.26 in | 72.5°F | 52.6°F | 0.79 in |
| November | 62.6°F | 44.8°F | 2.43 in | 69.0°F | 46.4°F | 1.81 in |
| December | 59.0°F | 42.9°F | 5.17 in | 65.0°F | 43.7°F | 3.08 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 →