January in Gillam is the cloudiest and the most freezing month of the year. In January, the weather in Gillam is typically freezing. Average daily high temperature in January is about 20 degrees below zero. On average, Gillam has 29 cloudy and 2 snowy days in January. The snowfalls are usually light. January as well as February, March, September, and October is considered the most uncomfortable time to visit Gillam.