Your clutch could be stuck to the flywheel from condensation forming.
This is a common problem and you can prevent this from happening if you place a block of wood between the clutch pedal arm and the underside of the step, this keeps the parts separated when not in use.
There is a hole in the bottom of the bellhousing that has a cotter pin in it that is called a "jiggle drain" and it should be kept clean, this prevents water from collecting inside the bellhousing.