Climate twins of Umatilla, OR

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

Top match: Sparks, NV

Month	Umatilla			Sparks
	High	Low	Precip	High	Low	Precip
January	41.1°F	30.0°F	0.88 in	48.2°F	24.7°F	1.28 in
February	46.2°F	31.7°F	0.70 in	52.9°F	27.4°F	1.00 in
March	55.5°F	35.2°F	0.76 in	59.7°F	32.0°F	0.85 in
April	62.9°F	41.5°F	0.70 in	65.0°F	36.3°F	0.51 in
May	71.9°F	48.1°F	0.75 in	73.9°F	43.1°F	0.69 in
June	79.2°F	54.3°F	0.45 in	83.9°F	49.4°F	0.39 in
July	88.5°F	60.5°F	0.19 in	92.1°F	55.4°F	0.42 in
August	87.7°F	60.8°F	0.25 in	90.8°F	53.3°F	0.28 in
September	78.0°F	53.4°F	0.40 in	83.6°F	46.1°F	0.24 in
October	64.3°F	44.1°F	0.74 in	71.6°F	36.5°F	0.91 in
November	50.6°F	35.3°F	0.87 in	57.2°F	29.2°F	0.70 in
December	41.2°F	30.7°F	1.22 in	47.0°F	24.5°F	1.11 in

Cities that consider Umatilla their climate twin

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

Sparks, NV (ranks Umatilla #1)
Reno, NV (ranks Umatilla #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 →