January in West Haven averages a daily high of 3.8°C with nights around -4.4°C. Expect roughly 9.4 wet days totalling 60.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit West Haven is May–June.
Based on NEW HAVEN TWEED AIRPORT, CT US (5km), 1995–2024. 23 years of January data.