Is it colder or warmer near a lake?

Its relatively warm water (warm compared with colder wintertime air temperatures) keeps temperatures over the lake and at the lakefront higher than inland readings. In the summer, however, lake water temperatures are usually cooler than inland air temperatures, and daytime readings at the lakefront will be lower.



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We now have a micro (small) scale circulation — the lake breeze. This lake breeze that develops in the spring can cause a 30 degree difference in temperature over a few miles. It can oscillate back and forth, where you a warm one minute, but cold the next. We see this on a grand scale as well around the globe.

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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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Lakes have layers Water temperatures also play a role in water density. Warm water is less dense meaning it is lighter and stays toward the top of the lake. The colder, heavier water is found at the bottom.

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The Profundal Zone or Hypolimnion (cold water region) can be found below the Euphotic Zone. This zone is located under the thermocline where the sunlight does not penetrate the water. Again, the size of this zone depends on the age and water clarity of the pond or lake.

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In a lake, shallower water gets warmer. So do spots that are in the sun compared to shade. All the heat is coming down from the sun, so top layers get warm first. In sections of the lake with deep water, the water underneath siphons off some of the top layer's heat (hence shallow water is warmer than deep).

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Lake temperatures are largely driven by interactions with the atmosphere, so colder air temperatures lead to colder lake temperatures, according to the NOAA Great Lakes Environmental Research Laboratory (GLERL).

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