Windchill is closely related
convective cooling. Its common knowledge that
windchill causes cold temperatures to feel
colder. That is simply because it allows the
air around us to more rapidly gain heat from
our bodies.
When standing still a layer of air around the
body sticks with you and keeps that immediate
air warmer thus cooling you more slowly. With
a little wind that warm layer is stripped away
and your body faces the brunt of the cold.