What is the term for the deck that is exposed to weather conditions on a ship?

The term for the deck that is exposed to weather conditions on a ship is referred to as the weather deck. This deck is designed to withstand the elements, meaning it can be affected by wind, rain, and sun exposure. The weather deck is typically the uppermost deck on a vessel, where crew members may conduct activities outside and be directly exposed to atmospheric conditions.

The main deck, while it might sometimes be considered the weather deck depending on the ship's design, is primarily defined as the principal deck of a ship, which includes both weather-exposed areas and potentially enclosed or sheltered areas. The flight deck pertains specifically to aircraft carriers, where aircraft are launched and recovered, and is distinct from general weather exposure considerations of other decks. The mess deck serves as the dining area for the crew and is usually located below deck, offering shelter from weather conditions, which contrasts with the concept of a weather deck that is primarily exposed to those conditions.