Today I commuted to work, and rode home wearing (besides business casual) long underwear, wool socks, a good foul weather coat, helmet cover, cashmere hat, neoprene face mask, and my new winter gloves. And a sweatband, because that's how I roll. This was just about perfect.
The gloves, Specialized Element 1.5s that I picked for the fit and because they'll take liners, aren't really cold-rain gloves, and I have another pair that are. But I wanted to see how they'd do, and the answer is that for 15 or 20 minutes at least they were just fine. This bodes well for how they'll do in real snow, when the rain gloves are out of their depth temperature-wise.