January in Gillam is the most freezing month of the year. In January, the weather in Gillam is typically freezing. Average daily high temperature in January is about 19 degrees below zero. On average, Gillam has 10 cloudy, 9 partly cloudy, 6 snowy, and 6 sunny days in January. The snowfalls are usually light. January as well as February and December is considered the most uncomfortable time to visit Gillam.