December in Hammond averages a daily high of 2.6°C with nights around -5.3°C. Expect roughly 11.1 wet days totalling 63.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hammond is August–September.
Based on PARK FOREST WATER, IL US (17.9km), 1995–2024. 30 years of December data.