July in Bol'shoye Gangozero is the rainiest and the warmest month of the year. In July, the weather in Bol'shoye Gangozero is typically warm. Average daily high temperature in July is about 21 degrees above zero. On average, Bol'shoye Gangozero has 15 rainy, 9 partly cloudy, 4 sunny, and 3 cloudy days in July. The rains are usually heavy.