January in Watervliet is the snowiest and the coldest month of the year. In January, the weather in Watervliet is typically freezing. Average daily high temperature in January is about zero. On average, Watervliet has 10 partly cloudy, 8 sunny, 6 cloudy, 4 snowy, and 3 rainy days in January. The snowfalls are usually heavy. January as well as February, March, April, and November is considered the most uncomfortable time to visit Watervliet.