Weather can make or break a road trip, so here's some data about year-round temperatures in Hicksville to help you plan yours: The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and February, with an average of -1°C. The snowiest months in Hicksville are January, December, February and November, with each month seeing an average of 13 cm of snowfall.