In December, the weather in Tomakomai is typically freezing. Average daily high temperature in December is about 1 degree above zero. On average, Tomakomai has 11 snowy, 9 rainy, 7 cloudy, 3 sunny, and 1 partly cloudy day in December. The snowfalls are usually moderate. December as well as March, April, May, and July is considered the most uncomfortable time to visit Tomakomai.