Groton is located in Grafton county New hampshire with a geographic area of square miles. The total population in Groton is 440 with 53.4% male and 46.6% female. Children under age 5 represent 0.0% of the population, under age 18 equal 11.8% of the population and over age 65 is 25.2% of the population. The median household income is $59,000, per capita income is $33,423. There are a total of 198 housing units with 94.4% owner occupied. Education includes 38.9% of residents that are high school graduates and 22.2% with a bachelor's degree or higher. The average temperature in Groton in the summer is 68 degrees, and in the winter 23 degrees.