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.
In human beings the urine production is controlled by water retaining principles and some aderno-cortical hormones. The urine is an aqueous solution of organic nitrogenous wastes, inorganic salts and certain other metabolic substances. Sometimes in men the enlargement of prostate are increase in frequency of urination during daytime. The prostate gland is a part of the male genital apparatus, located near and surrounding the outlet of urinary bladder.
People may also make more urine in the winter as in the summer because in warm weather, the body gets rid of more fluid by sweating. we urinate more in winter because our bodies do not release as much water through perspiration etc as we would in summer time.
The human body has several different methods for releasing liquids. One is through perspiration and the other is through urine. In the warmer months while humans may increase liquid intake due to thirst, they are also more likely to perspire a greater amount. The liquid is then evaporated into the environment. In the winter a human perspires less and there fore may produce less urine.
Please note that I am not a physician. For additional information in relation to any medical conditions, please refer to your physician.