Grantham is located in Sullivan County, New Hampshire. There are roughly 2,845 residents, living in 1,194 households. The average temperature for Grantham this time of the year is low of 56F and high of 79F. On average, Grantham gets about 4.16 inches of precipitation in July. Most residents are home owners (89%), have a post secondary degree (60%) and are married, no kids (46%).
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