The short answer is yes; however it is imperative that they don't stay that way. Most people don't realize the amount of damage that can occur when a boat is stored wet: rust, corrosion and mold are just a couple examples. The only 2 recommended methods for long term storage are either to store it inside or to have it professionally shrink wrapped. If it must be stored outside make sure it is covered (and that the cover is supported and properly vented, that way water doesn't pool and damp air can escape), that the bow is up and that all the drain plugs-and wet gear are removed.
Air warms during the day and rises, vents are vital so that the warm, damp air has a way out. Non vented plastic or waterproof covers trap moisture in and do much more damage than good. Covers also need support which allows no puddling on the cover. Quality boat covers made from materials such as Sunbrella® or Sharkskin® can have additional vents added and pole type supports.
These easy preventative measures will help ensure a fun season on the water for years to come.