I usually leave mine on until the weather becomes warm enough for regular driving with the roof down,cant see this being until mid march--early april at least.
Im not one for driving with the roof down on a freezing cold day just because the sun is out.
Just because we've had one nice day doesn't mean we're snow/ice free just yet.Mine will stay on for another month yet,as will the winter tyres on my wife's car. End of March will be the time when I get busy sorting out the cars for Summer.