Wind will remove temperature down to the air temp faster. On a sunny day, the road surface will heat water above freezing, splash on a bike (and parts) that's at air temp (below freezing) and you get some funny stuff.
This was a ride about 2 years ago in similar conditions, temps just below freezing with sun and strong winds.
Here's the bottom bracket:
And this funny little ice fender, the tire just barely clears this ice ... you couldn't design something with tolerances this close.
