Planning for the weather is a good way to make your trip to Hershey relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are February and January, with an average of 0°C. The snowiest months in Hershey are March, December, November and January, with each month seeing an average of 25 cm of snowfall.