In April, the weather in Vostok is typically cold. Average daily high temperature in April is about 2 degrees above zero. On average, Vostok has 8 cloudy, 7 rainy, 6 sunny, 5 partly cloudy, and 4 snowy days in April. The rains are usually moderate. April as well as January, February, May, and June is considered the most uncomfortable time to visit Vostok.