As soup posted, watch your batteries, keep one in an inside pocket. Batteries do lose their ability to deliver ccharge when they are cold, but they don't actually lose any charge, so they will recover when warmed up.
The polarizer will actually lose you between 1 and 1.5 stops, I have not seen 2 or more stops of reduction, except on sky right at 90° from the sun. Do remeber that the effect of a polarizer on hair and skin can be undesirable, making them look very "flat" or non-reflective.
Keep a sharp eye on the histogram, as posted you probably will need to use positive exposure compensation to avoid underexposure.
When coming in to a warm place from the cold, warm the camera up slowly if possible. You will very likely get condensation on the camera & lenses. Keep power OFF until condensation disappears. Condensation also cna happen inside on electronics, and the combination of condensation and electric current does bad things. Permanent bad things.
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