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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 64F and high of 84F. On average, New Castle gets about 4.55 inches of precipitation in July. Most residents are home owners (91%), have a post secondary degree (62%) and are married, with kids (43%).