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Brake fluid, like any other fluid, contracts (takes up less volume) when cold. The colder it gets, the less volume it takes up. (Yes, I know water is weird in this instance!!) Now, if you are AT, or very near the low mark, it could be that the extreme cold makes the volume just low enough to set off the sensor. Or course, when you use your brakes, you heat up the fluid, and the level will rise a tiny bit. The first thing I would do, is just check your fluid level. It could be other things like a sticky brake light switch, air in the lines, but I'd first off insure the fluid level is okay.
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