Weather is probably a major factor when you plan your trip to Lang Co, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and July with an average temp of 83°F, while the coldest months are January and February with an average of 72°F. The rainiest months in Lang Co are November, October, September, and December, with each month seeing an average of 19 inches of rainfall.