May was even cooler, with the highest touching just 41.6 degrees Celsius. IMD data shows the mean maximum temperature for June is 37.5 degrees Celsius, two below the monthly normal of 39.5 degrees. So far the warmest day has been degrees Celsius on June 9. Earlier on May under the influence of Cyclone Tauktae, the city recorded the highest ever single-day rainfall for the month of May. The impact of Cyclone Yaas then helped keep the mercury level from rising. Normal temperatures in May and June touch 43-44 degrees Celsius, with in 2019 being the maximum. Last year, four heatwave days were recorded in Delhi. The highest number of heatwave days recorded in Delhi in the last decade was seven in 2014. In Delhi most of the heatwave days occur in April May and first week of June. However, not a single heatwave hit the city from April onwards this year because of a series of western disturbances and cloudiness. Also, the maximum temperature this year has not reached the peaks of earlier years. Srivastava added, "Delhi is now seeing pre-monsoon activities, including thunderstorms and cloudiness, and monsoon is imminent. It is, therefore, unlikely that there will be heatwave day in the second-half of June. IMD data analysed by the Council on Energy, Environment and Water confirmed Delhi's maximum temperature in May this year was the lowest in the last 70 years. The summer of got rare relief from heatwave because of over five western disturbances and cyclone Tauktae" pointed out programme lead. Delhi recorded below normal maximum temperature and increased wet spells, with more than 60mm of single-day rainfall during a spell. This, coupled with the string of western disturbances, hindered the rise of mercury in NCR. This will also influence the intensity and onset of the monsoon.
