 As is typical of the Alaska Interior, Delta Junction has a subarctic climate (Köppen "Dwc").The average high temperature is below freezing from mid-October thru late March, and during the height of winter cold, as the town is located in USDA Plant Hardiness Zone 2, the coldest conditions of the year typically bottom out in the range, with sub- highs a common occurrence.Precipitation averages at only annually, and over half of this total occurs from June to August.