In April, the weather in Sumon U-Shynaansky is typically cold. Average daily high temperature in April is about 3 degrees above zero. On average, Sumon U-Shynaansky has 16 rainy, 7 cloudy, 5 snowy, and 2 sunny days in April. The rains are usually heavy. April as well as January, February, May, and June is considered the most uncomfortable time to visit Sumon U-Shynaansky.