European heatwave

People cool off at a swimming pool on a hot summer day in Haltern, Germany, July 1, 2015. REUTERS/Ina Fassbender

Tatiana and Anneke Toth aged four, play in a fountain in Nottingham, Britain June 30, 2015. REUTERS/Darren Staples

Aiden (L) and Ty Johnston play under a fountain in Nottingham, Britain June 30, 2015. REUTERS/Darren Staples

A man relaxes in St James Park on a warm day in London, Britain June 29, 2015. REUTERS/Neil Hall

People cool off at a beach on the shores of the Silbersee lake on a hot summer day in Haltern, Germany, July 1, 2015. REUTERS/Ina Fassbender

Brothers Balazs Hegedus (L) and Patrick Pataki sit in an inflateble dingy as they paddle in the sea on a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke Macgregor

Children collect water at a public fountain at the Louvois square on a hot summer day in central Paris, France, July 1, 2015. REUTERS/Charles Platiau

Lifeguards Chris Payne (L) and Nina Bassam keep watch on a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke Macgregor

Sun hats are seen for sale in converted telephone boxes on a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke MacGregor

Tatiana Toth runs through a fountain in Nottingham, Britain June 30, 2015. REUTERS/Darren Staples

Hadley Eames covers Gemma Cousins with stones as they sunbathe on a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke MacGregor

Tourists pose as a friend photographs them in front of Buckingham Palace during hot weather in central London, Britain June 29, 2015. REUTERS/Neil Hall

People relaxing on a beach on the shores of the Silbersee lake on a hot summer day in Haltern, Germany, July 1, 2015. REUTERS/Ina Fassbender

People sit in deck chairs on a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke MacGregor

A woman runs with a boy through a fountain in Nottingham, Britain June 30, 2015. REUTERS/Darren Staples

Sunbathers and swimmers enjoy a hot Summer day at Brighton beach in Britain June 30, 2015. REUTERS/Luke Macgregor

People relax in deck chairs in St James Park on a warm day in London, Britain June 29, 2015. REUTERS/Neil Hall

A man dives from a jetty into the Bassin d'Arcachon Sea during a warm and sunny day in Arcachon near Bordeaux, southwestern France, July 1, 2015. REUTERS/Regis Duvignau