December in Speyer averages a daily high of 6°C with nights around 0.9°C. Expect roughly 15.6 wet days totalling 58.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Speyer is May–September.
Based on WAGHAUSEL KIRRLACH, GM (11.4km), 1995–2024. 30 years of December data.