If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Zhangmutou: The hottest months are usually July and August with an average temp of 83°F, while the coldest months are January and December with an average of 63°F. The rainiest months in Zhangmutou are June, May, August, and July, with each month seeing an average of 13 inches of rainfall.