Petersham, MA has a humid continental climate with warm summers and cold winters. Winters tend to be quite wet and snowfall is normal for the season. Summers are usually hot, although temperatures rarely reach the high 90s and low 100s. Spring and autumn are relatively mild with temperatures ranging from the mid-50s to mid-80s throughout the season. The area experiences occasional thunderstorms, though there is generally enough rain throughout the year to maintain healthy plant life.
Petersham, Massachusetts gets 51 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Petersham averages 62 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 197 sunny days per year in Petersham. The US average is 205 sunny days.
Petersham gets some kind of precipitation, on average, 124 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 80 degrees
Winter Low: the January low is 12
Rain: averages 51 inches of rain a year
Snow: averages 62 inches of snow a year