Urination is the bodies way of disposing of excess/waste water.
In the summer, it is typically hotter and people sweat more, so more of the water in your body will be evaporating away through sweat.
In the winter, it is colder and people sweat less, so the water that would have been sweated and out evaporate will instead stay in the body and need disposed of elsewhere – urination being the main method.
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