The month of November was the coldest in the national capital in 71 years, with minimum temperature dropping to 10.2 degrees Celsius, according to the IMD (India Meteorological Department).
Delhi had last recorded a minimum temperature of 10.2 degrees Celsius in November 1949.
IMD data states that the minimum temperature for November was 9.6 degrees Celsius in 1938; nine degrees Celsius in 1931 and 8.9 degrees Celsius in 1930.
Normally, the mean minimum temperature for the month of November is 12.9 degrees Celsius.
The mean minimum temperature was 15 degrees Celsius last year, 13.4 degrees Celsius in 2018 and 12.8 degrees Celsius in 2017 and 2016.
Kuldeep Srivastava, the head of the IMD’s regional forecasting centre said, “However, for small areas such as Delhi, a cold wave can be declared if the criteria is fulfilled even for a day,”.
On Monday, Delhi recorded a minimum of 6.9 degrees Celsius. This is the eight day this month that the minimum temperature remained below 10 degrees Celsius.
“On November 23, Delhi recorded a minimum of 6.3 degrees Celsius — its lowest minimum temperature in the month since November 2003, when the city recorded a minimum of 6.1 degrees Celsius, according to Srivastava. The minimum temperature this month, barring on November 16, has remained 2-3 degree Celsius below normal in the absence of a cloud cover on most days” IMD officials.
Clouds trap some of the outgoing infrared radiation and radiate it back downward, warming the ground.