Remember the spare also must be inflated to the same pressure as the 4 tires hitting the road. 32-35 should be fine for winter driving (depending on your location) as the temp never really gets much above 50 degrees F.
jazzy - don't worry about the tire pressure sensor in the winter times. Once you start driving a couple miles the tires will warm up and the sensor will go off. I had the same happen the last 2 days since its been cold.