Porsgrunn, in Telemark, Norway, is home to roughly 34,400 people in the Europe/Oslo time zone at 59.1°N latitude.
In 2025, Porsgrunn recorded an average annual temperature of 46°F. The hottest temperatures reached 84°F in July; the coolest were 1°F in February. Total precipitation for the year was 48 inches, with the wettest month being September. Snowfall for the year totaled approximately 12 inches.
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