My skin is like my piano: in cold weather it goes out-of-tune. The piano is an old upright: the strings are held tight by metal pegs that are fixed by brute force in a piece of wood, the soundboard. Wood is sensitive to humidity. In cold weather, the air contains little water and the soundboard dries out. The wood then shrinks, the pegs slip in their holes, the strings slacken and the piano goes out of tune. Call the piano tuner.
He advises we use a humidifier in the room to help keep the piano in tune.
My skin tells me when the piano needs tuning, because my skin also dries out in the cold weather, and then it itches! Not only the cold weather, but also with the central heating. This warms up the cold dry air. The now hot dry air absorbs the water from the soundboard, and my skin, leaving both dry and out-of-tune.
So the skin needs more frequent use of moisturiser in cold weather.