Large water bodies, such as lakes, have a significant ameliorating influence on the local climate. In winter, the water serves as a heat source and keeps the surrounding areas slightly warmer than areas outside its influence. In spring, the water serves as a heat sink and keeps the surrounding areas colder. This has a significant impact in delaying bloom of fruit trees and thereby reducing potential damage from spring frosts. This is a major reason why, for example, the fruit industries in New York and Ontario are located around Lake Erie and Lake Ontario.
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