I have gotten pretty good at leaving the cuffs of my riding jacket open (like air scoops) and getting my handgrip position so that air flows up the sleeves. If I get it just right, then air will flow up one sleeve and down and out the other. Sweat gone, feels great (for a while).
7 F here this morning, not going to work up a sweat today!
I once left the sleeves of my jacket loose to scoop up the cool air until one day I scooped up a yellow jacket. He was not happy about that at all and it lead to a rapid deceleration and strip down on the side of the road on my part. Cuffs are nice and tight before I roll these days.
