Other facts from our historical weather data: Which months have the greatest rainfall in Deqen? Most rainfall (rainy season) is seen in June, July and August. When is winter in Deqen? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Deqen? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Deqen? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in Deqen? July tops the wettest month list with 222mm (8.7 in) of rainfall. Which is the driest month in Deqen? December is the driest month with 30mm (1.2 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.