April in Bol'shaya Kosul' is the rainiest and the windiest month of the year. In April, the weather in Bol'shaya Kosul' is typically cold. Average daily high temperature in April is about 6 degrees above zero. On average, Bol'shaya Kosul' has 22 rainy, 6 cloudy, and 2 sunny days in April. The rains are usually moderate. April as well as January, February, May, and September is considered the most uncomfortable time to visit Bol'shaya Kosul'.