Weather is probably a major factor when you plan your trip to Deokhyeon, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 74°F, while the coldest months are January and December with an average of 33°F. The rainiest months in Deokhyeon are July, August, September, and June, with each month seeing an average of 9 inches of rainfall.