In December, the weather in Ust'-Donetskiy is typically cold. Average daily high temperature in December is about zero. On average, Ust'-Donetskiy has 20 cloudy, 6 snowy, 3 rainy, and 2 sunny days in December. The snowfalls are usually light. December as well as March and November is considered the most uncomfortable time to visit Ust'-Donetskiy.