Climate twins of Lewistown, MT

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

Top match: Virginia City, MT

Month	Lewistown			Virginia City
	High	Low	Precip	High	Low	Precip
January	34.4°F	12.9°F	0.58 in	36.9°F	15.0°F	0.67 in
February	35.3°F	13.9°F	0.49 in	38.9°F	15.4°F	0.59 in
March	44.3°F	21.4°F	0.87 in	47.2°F	22.1°F	0.93 in
April	53.0°F	28.8°F	1.71 in	54.3°F	28.5°F	1.75 in
May	62.6°F	37.4°F	2.88 in	64.2°F	36.6°F	2.37 in
June	71.0°F	45.1°F	3.35 in	72.6°F	43.1°F	2.74 in
July	81.6°F	50.7°F	1.76 in	82.6°F	49.8°F	1.33 in
August	81.1°F	49.6°F	1.69 in	81.3°F	48.6°F	1.14 in
September	70.4°F	41.5°F	1.39 in	71.4°F	41.2°F	1.19 in
October	56.0°F	30.8°F	1.27 in	57.6°F	31.4°F	1.35 in
November	43.4°F	20.9°F	0.67 in	43.8°F	21.3°F	0.82 in
December	35.0°F	13.6°F	0.51 in	35.3°F	13.9°F	0.77 in

Cities that consider Lewistown their climate twin

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

Hill City, SD (ranks Lewistown #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 →