Delhi Reels Under Heatwave with Max Temp 43.1 Deg C, Highest Since 2012, No Respite for 7 More Days

For the plains, a “heatwave” is declared when the maximum temperature is more than 40 degrees Celsius, and at least 4.5 notches above normal. A “severe” heatwave is declared if the departure from normal temperature is more than 6.5 degrees Celsius, according to the IMD.