December in Irondequoit averages a daily high of 3.5°C with nights around -3.5°C. Expect roughly 18.4 wet days totalling 67.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Irondequoit is May–September.
Based on FREDERICK DOUGLASS GREATER ROCHESTER INTERNATIONAL AIRPORT, NY US (13.2km), 1995–2024. 30 years of December data.