Other facts from our historical weather data: Which is the warmest month in Ust'-Koksa? July has an average maximum temperature of 21°C (70°F) and is the warmest month of the year. Which is the coldest month in Ust'-Koksa? The coldest month is January with an average maximum temperature of -13°C (9°F). Which is the wettest month in Ust'-Koksa? June tops the wettest month list with 92mm (3.6 in) of rainfall. Which is the driest month in Ust'-Koksa? January is the driest month with 32mm (1.3 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.