January in Duluth averages a daily high of -5°C with nights around -13.9°C. Expect roughly 6.5 wet days totalling 21mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Duluth is June–September.
Based on SUPERIOR, WI US (6.8km), 1995–2024. 28 years of January data.