I do know of a glove that's both waterproof and usable in like 30-60 degrees - the Specialized Subzero glove has an inner liner and a waterproof outer shell:
http://www.specialized.com/us/en/bc/...=9406&eid=5095



The shell works well by itself as a glove. That's my current favorite.


I also know the Gore Bikewear Cross glove is waterproof but pathetically insulated - probably a good thing for this situation though, right? :-)
http://www.gorebikewear.com/remote/S...1208436857364A

I've also liked the look of their countdown gloves:
http://www.gorebikewear.com/remote/S...1208436857364A



But haven't been able to find them in person yet.