My work is as a desk jokey so feel free to ignore this.
I use the deerskin gloves from Murdochs for most outside work, including car work a week ago when it was 20. Seem to keep my fingers from becoming stiff from the cold. Not sure how much extra dexterity you need.
If you need bare finger dexterity I would start with the nylon/polyester type gloves, then get some lined gloves and cut off a few fingers from the lined gloves.
Just a thin layer of protection will prevent the nasty cold suckout and stiff fingers.
Also, I see that there is disposable liner gloves in cotton at wallmart website. There are some disposable liners in nylon geared for clean room use. These will shred over time but may last a few hours for the job at hand.

