Firefighters have issued a warning of the dangers of swimming in open water during the summer months.
West Yorkshire Fire and Rescue said that around 40 people drown in the UK after swimming in open water.
A spokesman added that people should not be tempted to jump into open water during the hot weather.
Ian Bicton, area manager for fire safety, said: “Although it is extremely warm, water temperatures will remain low, averaging around 10C.
“Cold water shock is a condition that occurs suddenly and affects the heart and muscles, making a person unable to swim and research has proved that strong swimmers are just as susceptible.
“Our advice is to enjoy the current summer-like weather, but if you feel like a swim, only use recognised pools.”