Climate twins of Rock River, WY

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

Top match: Bear River, WY

Month	Rock River			Bear River
	High	Low	Precip	High	Low	Precip
January	31.3°F	10.3°F	0.41 in	29.8°F	13.6°F	0.41 in
February	34.8°F	11.5°F	0.63 in	31.5°F	14.8°F	0.53 in
March	45.6°F	18.1°F	0.72 in	40.7°F	22.0°F	0.45 in
April	55.1°F	25.0°F	1.38 in	50.2°F	28.0°F	0.99 in
May	64.8°F	33.3°F	1.74 in	60.8°F	36.6°F	1.75 in
June	77.4°F	42.6°F	1.38 in	71.8°F	44.4°F	1.06 in
July	85.3°F	48.3°F	1.11 in	82.0°F	52.9°F	0.55 in
August	83.0°F	45.9°F	0.82 in	80.1°F	51.1°F	0.83 in
September	73.6°F	36.3°F	0.96 in	69.9°F	42.8°F	1.01 in
October	59.1°F	26.7°F	1.01 in	55.7°F	32.1°F	0.99 in
November	42.8°F	17.6°F	0.55 in	40.6°F	21.6°F	0.56 in
December	32.8°F	10.7°F	0.49 in	29.7°F	13.8°F	0.38 in

Cities that consider Rock River their climate twin

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

Bloomington, ID (ranks Rock River #1)
St. Charles, ID (ranks Rock River #1)
Dillon, MT (ranks Rock River #2)

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 →