Weather is probably a major factor when you plan your trip to Heihe City, and keep 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 temp of 64°F, while the coldest months are January and December with an average of 2°F. The snowiest months in Heihe City are January, February, December, and November, with each month seeing an average of 23 inches of snowfall.