Wellesley Island is located in Jefferson County, New York. There are roughly 555 residents, living in 266 households. The average temperature for Wellesley Island this time of the year is low of 54F and high of 75F. On average, Wellesley Island gets about 3.13 inches of precipitation in June. Most residents are home owners (78%), have a post secondary degree (54%) and are single, no kids (43%).
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