Water is also less dense as it heats up too. And likely this less denseness increases evaporation also so more rain

This might be why coffee or tea is hotter on the surface of a cup also I have noticed.

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When water is heated, the water molecules move faster and spread out more. This makes hot water less dense than room temperature water. Since hot water is less dense, it floats on the room temperature water.

Heat Up and Cool Down - American Chemical Society

American Chemical Society

https://www.acs.org › whatischemistry › experiments