Portsmouth, NH has a typical New England climate with warm summers and cold winters. The city experiences an average of 17 inches of snowfall each year, while during the summer months temperatures can reach up to 90 °F. July is typically the hottest month while January is the coldest month with average temperatures in the 20s. There is often precipitation throughout the year but it usually remains mild and not too heavy.
Portsmouth, New Hampshire gets 50 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Portsmouth averages 53 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 198 sunny days per year in Portsmouth. The US average is 205 sunny days.
Portsmouth gets some kind of precipitation, on average, 118 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 82 degrees
Winter Low: the January low is 14
Rain: averages 50 inches of rain a year
Snow: averages 53 inches of snow a year