December in Tallinn is the windiest month of the year. In December, the weather in Tallinn is typically freezing. Average daily high temperature in December is about zero. On average, Tallinn has 14 snowy, 10 rainy, 6 cloudy, and 1 sunny day in December. The snowfalls are usually light. December as well as March, October, and November is considered the most uncomfortable time to visit Tallinn.