It's 11 degrees here, going down to -1 tonight. We got 12-14" of fluffy white stuff last night, and had to dig out this AM at 6 degrees plus 35 mph gusts blowing powder. I love my snow thrower cab.
You've got to cover that cockpit. Better to cover the whole boat. Ice melt re-freezing in the scuppers and fittings seams leads to water inside, leaks and other damage.