I have some burton ski mittens that I tried to wear on the bike and my hands were roasting each time. I'm not sure how cold it would have to be for them to work, but the teens that it reaches here certainly isn't cold enough.

Grip shift. No problem in even the heaviest mittens.

SRAM triggers. Unlike Shimanos,they use two thumb levers. Easy to use even with thick gloves or mittens,and in heavy traffic you can keep a finger or two on your brake levers and still shift normally.

I'm trying Gripshift right now. It's just ok, I don't like it much, but I'm way more of a friction shifting kinda guy.

That said, I think I'll move back towards bar-end shifters and/or Falcon friction thumbies ($10 a pair!!!).

I don't care if you have a block of concrete over your hand, Falcon Friction Thumbies are easy.

There's huge variation in how cold your hands can get, so you really have to just keep trying things. I bought a pair of the PI lobster gloves a while back, and they were the next best thing to useless past -3C. I have been using the MEC Nanu gloves [get it? "Nanu-nanu!"]. They are good by themselves to about -20C, but quite warm when you get up to the freezing mark. I use fleece-lined pogies for anything around -20C or colder. They are the cat's ass in terms of keeping your hands warm and dry.

https://www.bdel.com/gear/element.php
I"ll chime in. These are some serious gloves for 40 dollars. The fleece liner was too warm for most the winter so I just used the shell and poly glove liners.
Scott

I think I'm going to get some better gloves this winter. It doesn't get terribly cold here compared to a lot of the places you guys live, and even the coldest weather here doesn't bother me much, but my hands get colder than anything. After that it's my feet and face.

ItsJustMe and others:

https://www.supercasuals.com/Kinco/Kinco_1927KW.cfm

IJM, you know the UP....well, living there I ONLY used the Kincos, and if you're like me and have hot hands then they'll do fine. I taught ski lessons at Marquette Mountain, and even down to -20degF these did the trick for me. Past that if I put in a thin liner I could go beyond

Blowing the drive, hauling hay for the barn, riding my bike in the snow (3mi. downhill to work, oh yeah) these puppies did it all.

I've used them for years mountaineering, backcountry skiing throughout the Rockies, the Cascades and the Sierra.

When they fall apart you don't feel bad because they're cheap...but they'll last 2 years of HEAVY use.

What I like most about 'em is I can still manipulate things with my fingers. I can actually un-zip a coat without removing gloves! Amazing. Like I said, check out your feed store or look online. Model 1927KW or, if you like the gauntlet style, the plain jane 1927.

Wow, thanks. If they're that good, I'll buy a pair for sure, and if I have to get them online, I'll just go ahead and get 3 or 4.

Yeah, and check around for a good price, too. I was able to get them at the feed in Marquette for $5 even.

If you haven't found gloves that can keep your hands warm, your issue might be one of poor circulation and/or failure to keep your core warm rather than inadequate gloves. Basically, your body's thermoregulation systems will decrease circulation to the extremities if the core feels chilled, in order to conserve heat. Less circulation means less warming for hands and feet, so if you want your hands and feet to be warm, the first step is to make sure that the core stays warm.