Since you have a generator, get a ceramic heater (space heater, buddy heater..) and stick it in the engine compartment for half an hour while you clear the snow off the blades and critical surfaces. Throw a blanket over the top for better effectiveness as well. Either way as has been said, if the battery is good it should start just fine.
One thing to look for, since it was sitting there without covers, is the little vent hole on top of the bleed valve. If that gets plugged with ice or snow, funny things happen during a start up attempt.