Weather is probably a major factor when you plan your trip to Chengbei, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and December, with an average of 9°C. The rainiest months in Chengbei are June, July, August and September, with each month seeing an average of 316 mm of rainfall.