Climate twins of Boulder, CO

These are the US cities whose 12-month climate pattern most closely matches Boulder'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: Boulder vs its climate twin

Top match: Walsenburg, CO

Month	Boulder			Walsenburg
	High	Low	Precip	High	Low	Precip
January	47.0°F	21.5°F	0.83 in	47.3°F	20.7°F	0.83 in
February	48.3°F	22.3°F	0.99 in	49.3°F	21.5°F	0.82 in
March	57.0°F	29.0°F	1.99 in	57.1°F	27.2°F	1.72 in
April	62.8°F	34.5°F	3.05 in	63.4°F	33.6°F	2.26 in
May	71.3°F	42.7°F	3.21 in	72.5°F	42.7°F	1.82 in
June	82.5°F	51.1°F	1.95 in	83.5°F	51.8°F	1.28 in
July	88.0°F	57.0°F	1.83 in	87.4°F	57.5°F	2.24 in
August	86.0°F	55.5°F	1.68 in	85.1°F	56.2°F	2.15 in
September	78.8°F	48.1°F	2.09 in	79.2°F	48.0°F	0.85 in
October	65.9°F	37.2°F	1.62 in	68.4°F	36.6°F	1.31 in
November	54.5°F	28.1°F	1.18 in	55.9°F	27.7°F	1.00 in
December	46.3°F	21.1°F	0.81 in	46.5°F	20.4°F	1.01 in

Cities that consider Boulder their climate twin

These US cities have Boulder in their top 3 most-similar list — meaning if you were to move from any of these places, Boulder would feel familiar.

Rye, CO (ranks Boulder #3)

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 →