But 2015 saw the worst heatwave in India since 1992, striking areas from Delhi to Telangana and killing 2,081 people. It was the fifth deadliest in world history
Searing heatwaves saw records tumble across Europe last month, with unusually high temperatures within the Arctic Circle as well
When the air temperature exceeds 35°C, the body relies on the evaporation of water - mainly through sweating - to keep core temperature at a safe level
The World Meteorological Organization said this week that 2019 was on track to be among the world's hottest years, and 2015-2019 would then be the hottest five-year period on record
Warming trends are strongest in the Arctic region, where 2018 saw the continued loss of sea ice
This was the second highest value for January-June in the 1880-2017 record