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 59F and high of 80F. On average, Wellesley Island gets about 2.64 inches of precipitation in July. Most residents are home owners (78%), have a post secondary degree (54%) and are single, no kids (43%).
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