The quantity of water that we intake in our food or in any other means need to be flushed out by one means or the other. The primary means of these are urine, stool, perspiration and breath. The frequency of urination in a day is roughly proportional to the quantity of water we need to flush out during a day. This in turn depends on the total water intake less the water loss through other means (stool, perspiration and breath). In summer, when the temperature is high we tent to perspire a lot losing a lot more water that way. As a result, in spite of higher water intake in summer, there is less water to bu flushed out as urine. IN contrast in winter we perspire very little, and therefore need to flush out more water through urine. Therefore, urination frequency is higher in winters.
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