Anything above 40 is (usually) pretty pleasant. Mid 30's and rain/sleet or just cloudy/high humidity gets pretty old after a couple of weeks.
Learn to love your heater. We wear Gore-Tex foulies and a few layers of wool underneath- works fine and stays warm when damp.
Here, it looks like the ice is breaking up so we should be heading up to our "summer" slip around the 3rd week of March.