Other facts from our historical weather data: Does Haicheng have a dry season? Yes, the months of January, February and December are very dry. When is winter in Haicheng? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Haicheng? July has an average maximum temperature of 31°C (88°F) and is the warmest month of the year. Which is the coldest month in Haicheng? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in Haicheng? August tops the wettest month list with 168mm (6.6 in) of rainfall. Which is the driest month in Haicheng? January is the driest month with 7mm (0.3 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.