Williamstown, NJ has a humid subtropical climate with warm summers and cool winters. The average high temperature during the summer months is around 83 degrees Fahrenheit and the average low temperature during the winter months is around 30 degrees Fahrenheit. The area receives an average of 43 inches of rain per year, mainly occurring in spring and early summer. Winters are usually mild with little snowfall. The area experiences occasional heavy thunderstorms with severe weather events occurring on occasion throughout the year.
Williamstown, New Jersey gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Williamstown averages 19 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 207 sunny days per year in Williamstown. The US average is 205 sunny days.
Williamstown gets some kind of precipitation, on average, 116 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 87 degrees
Winter Low: the January low is 23
Rain: averages 46 inches of rain a year
Snow: averages 19 inches of snow a year