Is it cooler living by a lake?

As the air over the land gets much hotter than the air over the water, that warmer air rises. The air over the water remains cooler and more dense than the rising air over the land, which then encourages the cooler air over the water to move inland to replace the rising warm air.



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During the summer the lake absorbs energy, but the land reradiates energy to the atmosphere. Therefore, air over land is warmer than that over the water. In the winter the energy absorbed by the lake water is gradually released to the atmosphere, making the air over the water warmer than that over the land.

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The massive Lakes act like heat sinks that moderate the temperatures of the surrounding land, cooling the summers and warming the winters. The lakes also act like giant humidifiers, increasing the moisture content of the air. In the winter, this moisture contributes to heavy snowfall known as “lake effect” snow.

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Lake-effect snow forms when dry, freezing air picks up moisture and heat as it moves along warmer lake water. This causes some of the lake water to evaporate into the air, causing the air to be warmer and wetter.

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Even some of the smallest lakes can create hazards downwind. The snow forms as chilly winds mainly from the west or northwest flow over the relatively warmer waters of the lakes and gather moisture, allowing clouds and bands of lake-effect snow to develop.

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During the early morning hours, the land and the water start out at roughly the same temperature. On a calm morning, a given pressure surface will be at the same height above both the land and water. A few hours later, the sun's energy begins to warm the land more rapidly than the water.

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Rain may have a cooling effect on the lake surface by lowering the near-surface air temperature, by the direct rain heat flux into the lake, by mixing the lake surface layer through the flux of kinetic energy and by convective mixing of the lake surface layer.

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In summer, the top of the lake becomes warmer than the lower layers. You've probably noticed this when swimming in a lake in summer - your shoulders feel like they're in a warm bath while your feet are chilled. Since warm water is less dense that colder water, it stays on top of the lake surface.

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