1978 or so; Raking Leaves at GLAKES (Great Lakes Naval Base north of Chicago and right smack dab on the shore of Lake Michigan); temp around 60-65; short sleeves; gentle breeze starts; after 5-6 seconds gets a bit stronger - never real hard; then air temp gets colder; ONLY 10-15seconds later, temp is hovering around 32degF - all in ~20seconds MAX. Very weird. Never experienced anything like it before or after.
Mercy was shown, however, and since no one had jackets, including the P.O. in charge (viz., me), packed up the rakes and called it a day. It was self-preservation - I would have been the one treating the hypothermia, no doubt.