Climate twins of Hartford, SD
These are the US cities whose 12-month climate pattern most closely matches Hartford'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: Hartford vs its climate twin
Top match: Morgan, MN
| Month | Hartford | Morgan | ||||
|---|---|---|---|---|---|---|
| High | Low | Precip | High | Low | Precip | |
| January | 25.3°F | 7.4°F | 0.66 in | 23.4°F | 5.7°F | 0.58 in |
| February | 30.0°F | 11.4°F | 0.80 in | 27.8°F | 9.6°F | 0.67 in |
| March | 43.3°F | 23.4°F | 1.47 in | 40.5°F | 22.5°F | 1.50 in |
| April | 57.0°F | 35.5°F | 3.03 in | 56.6°F | 34.9°F | 2.64 in |
| May | 69.9°F | 48.5°F | 3.74 in | 69.9°F | 47.5°F | 3.65 in |
| June | 80.4°F | 59.3°F | 4.59 in | 79.8°F | 58.1°F | 4.66 in |
| July | 84.8°F | 63.7°F | 3.31 in | 83.6°F | 61.6°F | 3.37 in |
| August | 81.7°F | 61.2°F | 3.34 in | 81.0°F | 59.0°F | 4.00 in |
| September | 74.8°F | 51.7°F | 3.04 in | 74.3°F | 50.2°F | 2.85 in |
| October | 60.6°F | 37.8°F | 2.29 in | 59.2°F | 37.3°F | 2.21 in |
| November | 43.6°F | 24.2°F | 1.19 in | 42.2°F | 23.9°F | 1.19 in |
| December | 30.4°F | 12.5°F | 0.84 in | 28.2°F | 11.7°F | 0.69 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 →