Is the fog on the watch related to the weather?

Fogging of mechanical watch is a serious fault, usually there is something wrong with the sealing ring, which leads to poor sealing. When the weather is cold, if you put your hand on the glass, there will be fog behind you, because of this temperature. Water vapor in high temperature air will condense into small water droplets when it meets cold glass.

This needs repairing. Go and replace the sealing strip. Fog will cause the internal parts of your watch to rust and slow down gradually. If the corrosion is serious, the maintenance will be more troublesome. The sooner you go, the better. Don't delay.

The old traditional method is to put the watch under a 40W desk lamp and take a close-up photo for 2 hours. Note that it is an ordinary light bulb, not an energy-saving lamp! This can dry. Oh, that's also a good idea.