Weather can make or break a road trip, so here's some data about year-round temperatures in Ironton to help you plan yours: The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of -8°C. The snowiest months in Ironton are March, April, January and December, with each month seeing an average of 16 cm of snowfall.