Titanic (1997) – IMDb

Despite near freezing air temperature and 28 F degree water temperature, the passengers on board the Titanic are not affected by the cold of either the freezing air or water until they are off the boat and in the water. When the ship is flooded with icy water Jack and Rose make their way through the water without freezing.

https://m.imdb.com/title/tt0120338/