Our experience, not far from where your boat is kept, is that it is usually not necessary to "winterize" the boat. This is assuming that there is some heat provided and the boat is checked regularily, at least twice a week. Also, like Steve we use the boat year round.
HOWEVER: in your case, where you will be mostly absent you should at the very least, IMO, ensure your thru-hulls are all closed, of course, and perhaps drain any areas that might potentially freeze on the fresh water system and the head, for example. And make sure the engine, if FWC, has adequate antifreeze protection.
Normally the 40 - 45 degF water is enough to keep internal components from freezing, but we can't count on "normal" conditions prevailing at all times.
A cautionary tale: several years ago a friend had his Westsail 32 sink at the dock over the Christmas break. He had electric heat on board and a light bulb in the engine box to keep the temperature above freezing. That year we had an unusually cold Christmas, and a wind storm knocked out the power. Now his electric heater(s) are not functioning. The intake strainer on the RW froze and cracked resulting in the sinking of the boat since he had neglected to close the thru-hull. The insurance claim was denied on the basis that he had not taken reasonable precautions to prevent this from happening. They paid the salvage, but that's all. He has recommissioned the vessel, but on his own.