Why it is cooler by a body of water in the summer and warmer by the body of water in the winter?

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This is because water has a higher thermal resistance compared to air.  So a large body of water resists temperature change much greater than the surrounding air.  So in the winter, water will tend to retain its heat and will take much longer to cool down even when the surrounding air is very cold.  Likewise, in the summer the water will take longer to heat up in comparison to the air around it.  That is why temperatures tend to more more moderated in locations near large bodies of water like the ocean.

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