Weather will likely play an important role when you plan your trip to Delta Junction, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and June with an average temp of 56°F, while the coldest months are January and December with an average of 3°F. The snowiest months in Delta Junction are October, December, November, and April, with each month seeing an average of 12 inches of snowfall.