Grantham, NH has a humid continental climate with warm summers and cold winters. The average annual temperature in Grantham ranges from 16°F (min) to 79°F (max). Average precipitation is approximately 40 inches of rain and 25 inches of snow annually. Summer days in Grantham are often sunny and mild, while winter months can bring periods of heavy snowfall. Winters tend to be colder than other areas of the same latitude due to its location in the White Mountains. Spring and fall offer mild temperatures and moderate rainfall, making it a great time to explore the outdoors.
Grantham, New Hampshire gets 47 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Grantham averages 71 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 199 sunny days per year in Grantham. The US average is 205 sunny days.
Grantham gets some kind of precipitation, on average, 132 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 79 degrees
Winter Low: the January low is 8
Rain: averages 47 inches of rain a year
Snow: averages 71 inches of snow a year