December in Pittsburgh averages a daily high of 5.8°C with nights around -1.8°C. Expect roughly 12.8 wet days totalling 73.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Pittsburgh is May–June.
Based on EMSWORTH L D OHIO RIVER, PA US (10.6km), 1995–2024. 25 years of December data.