With a population of around 21,900, Gelnhausen sits in Hesse, Germany. The city operates in the Central European time zone.
In 2025, Gelnhausen recorded an average annual temperature of 51°F. The hottest temperatures reached 95°F in July; the coolest were 16°F in November. Total precipitation for the year was 31 inches, with the wettest month being January. Snowfall for the year totaled approximately 4 inches.
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