Grantham is located in New Hampshire. Grantham, New Hampshire has a population of 3,168. Grantham is more family-centric than the surrounding county with 31% households with children. The county percentage for households with children is 23%.
The median household income in Grantham, New Hampshire is $102,067. The median household income for the surrounding county is $63,825 compared to the national median of $66,222. The median age of people living in Grantham is 51 years.
The average high temperature in July is 79.72 degrees, with an average low temperature in January of 7.64 degrees. The annual precipitation is 39.89.