December in Edison averages a daily high of 7.6°C with nights around -1.9°C. Expect roughly 10.3 wet days totalling 115.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Edison is May–June.
Based on NEW BRUNSWICK 3 SE, NJ US (5.2km), 1995–2024. 30 years of December data.