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Open Image ModalOnlookers lean over the bridge to watch people paddling in the Serpentine to cool off during the August 1911 heatwave. (credit:Topical Press Agency via Getty Images)
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Open Image ModalA group of boys paddling in the fountain at Trafalgar Square to cool off during the heatwave of August 1911. (credit:Topical Press Agency via Getty Images)
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Open Image ModalMen cover their heads with newspapers to protect them from the summer sun in July 1913. (credit:Topical Press Agency via Getty Images)
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Open Image ModalNannies with their charges under a tree in Kensington Gardens, London, during a heatwave in 1913. (credit:Topical Press Agency via Getty Images)
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Open Image ModalTwo clerks remove their jackets as they walk through Hyde Park in London, during the summer heatwave of May 1914. (credit:Topical Press Agency via Getty Images)
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Open Image ModalThree boys eating and drinking outside their improvised den during a heat wave in Regent's Park, circa 1920. (credit:FPG via Getty Images)
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Open Image ModalA roadman spraying down the dust with water in Temple Gardens, London, during a heat wave, 1925. (credit:Topical Press Agency via Getty Images)
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Open Image ModalTwo young ladies enjoy a cooling summer breeze on the roof of Australia House in London, 1926. (credit:Davis via Getty Images)
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Open Image ModalA coach horse gets drink from its driver during the big heat wave of 1930. (credit:Imagno via Getty Images)
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Open Image ModalLondoners in bathing suits taking advantage of a heat wave at Hyde Park lido in 1933. (credit:Topical Press Agency via Getty Images)
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Open Image ModalFour young girls cool off in a London bath, 1935. (credit:Imagno via Getty Images)
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Open Image ModalChildren enjoy a cooling drink from the fountain on Clapham Common in August 1937. (credit:H. Allen via Getty Images)
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Open Image ModalTwo young women in the Embankment Gardens, London, wearing Dolly Varden Sun Bonnets in 1939. (credit:George W. Hales via Getty Images)
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Open Image ModalA three-year-old boy playing in a fountain, during a heatwave, at Hampton Court Palace gardens, August 1947. (credit:George Konig via Getty Images)
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Open Image ModalA queue two miles long of holidaymakers at trying to get the seaside at Victoria station during the heatwave of 1949. (credit:Keystone-France via Getty Images)
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Open Image ModalLondoners sunbathing in Hyde Park in 1952. (credit:Daniel Farson via Getty Images)
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Open Image ModalSunbathers sit by the Serpentine at Hyde Park during the heatwave of 1954. (credit:Barratts/S&G and Barratts)
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Open Image ModalFive thousand people sunbathing in the Serpentine Lido in the sweltering London heat in 1961. At 4pm, the temperature reached 33C, equalling the record of 3rd June 1947. (credit:PA/PA Archive)
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Open Image ModalActress Lillimore Knudsen tries to fry an egg on the rooftop of a building in the London heatwave of 1955. (credit:Barratts/S&G and Barratts)
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Open Image ModalCrowds of people at Victoria Station in London waiting for trains to take them on their summer holidays in 1958. (credit:George W. Hales via Getty Images)
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Open Image ModalA group of women sunbathing in a circle at Purley Way Swimming Pool, Croydon, South London, in 1960. (credit:Reg Speller via Getty Images)
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Open Image ModalThe Oasis swimming pool in Holborn, one of the few cool spots among London's towering office blocks in the summer of 1969. (credit:PA/PA Archive)
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Open Image ModalA couple in swimwear on a stroll through a park with their child and his pram, east London, circa 1970. (credit:Steve Lewis via Getty Images)
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Open Image ModalA little girl making the most of the 29C heat during the July 1971 by paddling in the fountain in London's Trafalgar Square while the adults cooled off their aching feet. (credit:Douglas Miller via Getty Images)
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Open Image ModalJournalist John Wilson arrives at Fleet Street in shorts and vest as the 1975 heatwave in London continued. (credit:PA/PA Archive)
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Open Image ModalA Londoner sunbathing in Kensington Gardens with a knotted handkerchief protecting his head from the sunshine in 1976. (credit:Graham Wood via Getty Images)
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Open Image ModalThe scene at the Serpentine in London's Hyde Park as people enjoy the heatwave of 1976. (credit:PA/PA Archive)