December in Frankfurt am Main averages a daily high of 5.7°C with nights around 1.5°C. Expect roughly 14.7 wet days totalling 59.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Frankfurt am Main is May–September.
Based on FRANKFURT MAIN WESTEND, GM (1.7km), 1995–2024. 30 years of December data.