Sweating in summer on a hot day or after a long Sunday jog may feel good, or at least normal, but sweating in winter when the weather is cold or you just come out of the shower can be a nightmare for individuals suffering from a condition called Hyperhydrosis. One common cause is simply the change in the weather. Any temperature change, whether it’s getting warmer or colder, can trigger excessive sweating. Sweat is the main cause of foot odor, and it can happen even when you think it’s cold and don’t realize your feet are sweating. These variations in temperature will make your feet to work hard to regulate temperature. As a result, perspiration ensues.