Being outside all day will give you wind burn, especially when its cold and breezy.
In cold conditions your body will attempt to preserve heat by constricting the capillaries at the skin's surface. As soon as you begin to warm up ( i.e. after work) these capillaries open up allowing blood to flow near the surface of your skin, this will create a flushed appearance as well as a feeling of hotness in the face a bit like sun burn.