With a population of around 1,000, Kotlje sits in Municipality of Ravne na Koroskem, Slovenia. The city operates in the Europe/Ljubljana time zone.
In 2025, Kotlje recorded an average annual temperature of 51°F. The hottest temperatures reached 92°F in July; the coolest were 7°F in December. Total precipitation for the year was 37 inches, with the wettest month being July. Snowfall for the year totaled approximately 8 inches.
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