In December, the weather in Sumon Iymensky is typically freezing. Average daily high temperature in December is about 12 degrees below zero. On average, Sumon Iymensky has 15 partly cloudy, 11 sunny, 4 cloudy, and 1 snowy day in December. The snowfalls are usually light. December as well as January and February is considered the most uncomfortable time to visit Sumon Iymensky.