A motorcycle on a 39F day isn't warm, but with good gear it's not bad.
I still wouldn't want to make a long-distance trip(the wind finds any possible place to sneak in, like cold water with a wetsuit).
I've ridden in worse weather with worse gear; this wasn't bad at all.
Keeping track of the occasional remaining lumps of ice/slush does keep you alert.
I miss 50's being the lows.