The most pleasant months of the year for Onton are May, September and October. In Onton, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Onton with an average high temperature of 88.3°, which ranks it as warmer than most places in Kentucky. February is the snowiest month in Onton with 3.2 inches of snow, and 4 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.