If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Conneaut: The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are February and January, with an average of 0°C. The snowiest months in Conneaut are January, March, December and November, with each month seeing an average of 17 cm of snowfall.