December in Ulan-Ude is the snowiest month of the year. In December, the weather in Ulan-Ude is typically freezing. Average daily high temperature in December is about 15 degrees below zero. On average, Ulan-Ude has 16 cloudy, 7 partly cloudy, 5 sunny, and 3 snowy days in December. The snowfalls are usually light. December as well as January and February is considered the most uncomfortable time to visit Ulan-Ude.