In April, the weather in Ust'-Yansk is typically freezing. Average daily high temperature in April is about 10 degrees below zero. On average, Ust'-Yansk has 12 cloudy, 8 partly cloudy, 7 sunny, and 3 snowy days in April. The snowfalls are usually light. April as well as January, February, March, and November is considered the most uncomfortable time to visit Ust'-Yansk.