I wear a pair of relatively thin "runners gloves" that have digisensor pads on the thumb and index fingers so that you don't have to take off your gloves to answer/use your phone etc. Over that I overlay a pair of fingerless gloves, currently of Ragg wool but soon to be replaced with an even nicer pair of fleece fingerless gloves. The combo gives you touch (for camera controls etc) without actually exposing your skin to cold. The fingerless 2nd layer adds an insulation layer to all but the fingertips. If that's not enough, they make fingerless gloves with "convertible" mitten tops, ie they fold back and are held either by magnets, Velcro (not preferred), or an elastic band.
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