December in Hartford averages a daily high of 5.6°C with nights around -3°C. Expect roughly 11.6 wet days totalling 96.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hartford is May–June.
Based on HARTFORD BRAINARD AIRPORT, CT US (4.2km), 1995–2024. 30 years of December data.