With a population of around 1,100, Trelex sits in Vaud, Switzerland. The city operates in the Europe/Zurich time zone.
In 2025, Trelex recorded an average annual temperature of 53°F. The hottest temperatures reached 94°F in August; the coolest were 26°F in November. Total precipitation for the year was 55 inches, with the wettest month being September. Snowfall for the year totaled approximately 1 inches.
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