I've tried every winter cycling glove, ski gloves, in various combination. It gets cold here in January (it's 14 F outside right now). My coldest rides have been in the single digits (temperature, not "wind chill").
At this point in my life the Pearl Izumi Amfib Lobster gloves work down to 35 F. I add silk liner gloves and a disposable hand warmer per glove. There's room enough for my hands and all that. Yes, it's a bit clumsy compared to summer fingerless gloves, but if you're going to ride in the cold, go with these.
I have no opinion on their usefulness in cold, wet weather riding. I'm not insane.
FWIW, I splurged on a pair of Assos lobsters a while ago and the finger cutout was too deep and dug into the web between my fingers. These don't do that.
Highly recommended.
I have all three versions of the gloves, full lobster, this version, and five fingered. These are my favorite, providing excellent fit, generous warmth and the necessary dexterity for road di2 shifters. These are good down to freezing and a bit below. These also look promising for their weather resistance, something that cold weather gloves usually don't do a good job on, but it's a dry year here in the eastern High Sierra so I haven't had the opportunity to really put them to the test as of yet in this regard.
OK, Really cold for the Carolina's is upper 20's. I have ridden with these down to 32F and was comfortable. The addition of thin glove liners would make these comfortable well into the 20's I believe. Fingers are a bit long for me, but I have really short fingers. Still had no trouble with shifting my di2 shift levers.
