Planning for the weather is an important factor for making your trip to Jeongdong-myeon a success, especially when you're splurging. 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 39°F. The rainiest months in Jeongdong-myeon are July, August, September, and June, with each month seeing an average of 10 inches of rainfall.