Climate twins of Boulder, MT

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: Cut Bank, MT

Month	Boulder			Cut Bank
	High	Low	Precip	High	Low	Precip
January	35.0°F	11.9°F	0.28 in	32.3°F	11.3°F	0.22 in
February	37.8°F	14.0°F	0.19 in	34.2°F	12.0°F	0.23 in
March	46.8°F	20.8°F	0.40 in	42.6°F	19.7°F	0.36 in
April	54.5°F	27.0°F	0.78 in	52.3°F	28.1°F	0.95 in
May	63.6°F	35.3°F	1.86 in	62.3°F	37.0°F	1.65 in
June	72.0°F	42.5°F	2.30 in	70.4°F	44.7°F	2.73 in
July	82.5°F	48.3°F	1.38 in	80.2°F	49.6°F	1.29 in
August	82.0°F	46.2°F	1.12 in	79.7°F	48.0°F	0.96 in
September	71.9°F	38.1°F	1.10 in	68.7°F	40.1°F	1.08 in
October	57.4°F	27.7°F	0.64 in	54.4°F	29.7°F	0.57 in
November	42.4°F	18.6°F	0.48 in	41.0°F	20.2°F	0.42 in
December	33.6°F	11.5°F	0.27 in	32.9°F	12.6°F	0.31 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.

Cut Bank, MT (ranks Boulder #1)
Shelby, MT (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 →