The longest heatwave in the world was at Marble Bar in Western Australia from the 31st of October 1923 to the 7th of April 1924, 160 days of temperatures of or over 37.8 degrees Celsius (100 degrees Fahrenheit) The highest temperature recorded during the heatwave was on the 18th of January 1924, it was 47.5 degrees Celsius. Now that’s a climate extreme and an interesting weather fact!