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New Castle is located in Westchester County, New York. There are roughly 17,706 residents, living in 5,822 households. The average temperature for New Castle this time of the year is low of 49F and high of 71F. On average, New Castle gets about 4.77 inches of precipitation in May. Most residents are home owners (91%), have a post secondary degree (62%) and are married, with kids (43%).