Climate twins of Longmont, CO
These are the US cities whose 12-month climate pattern most closely matches Longmont'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: Longmont vs its climate twin
Top match: Fort Laramie, WY
| Month | Longmont | Fort Laramie | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 44.5°F | 14.4°F | 0.56 in | 43.0°F | 15.3°F | 0.24 in |
| February | 46.8°F | 17.1°F | 0.57 in | 45.0°F | 17.1°F | 0.53 in |
| March | 56.8°F | 26.1°F | 1.17 in | 54.8°F | 23.5°F | 0.80 in |
| April | 63.2°F | 32.3°F | 2.04 in | 61.9°F | 30.1°F | 1.71 in |
| May | 72.7°F | 41.4°F | 1.97 in | 71.0°F | 40.6°F | 2.93 in |
| June | 83.9°F | 50.5°F | 1.75 in | 82.8°F | 50.0°F | 2.19 in |
| July | 90.8°F | 55.4°F | 1.69 in | 91.0°F | 56.5°F | 1.78 in |
| August | 87.8°F | 53.7°F | 1.95 in | 89.2°F | 54.1°F | 1.36 in |
| September | 80.3°F | 45.8°F | 1.26 in | 79.8°F | 43.8°F | 1.39 in |
| October | 66.2°F | 32.9°F | 1.04 in | 65.2°F | 31.1°F | 1.13 in |
| November | 53.5°F | 23.5°F | 0.75 in | 52.0°F | 22.1°F | 0.46 in |
| December | 44.8°F | 14.5°F | 0.46 in | 42.6°F | 15.4°F | 0.42 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 →