Delhi witnesses coldest November in 71 years

With the mean minimum temperature dropping to 10.2 degrees Celsius, Delhi this year witnessed the coldest November in 71 years, the India Meteorological Depar tment has said. Earlier in 1949, Delhi had recorded a mean minimum temperature of 10.2 degrees Celsius in the month of November. The mean minimum temperature for November was 9.6 degrees Celsius in 1938; nine degrees Celsius in 1931 and 8.9 degrees Celsius in 1930, according to IMD data.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.Delhi also braved four cold waves in November –on the 3rd, 20th, 23rd and 24th. For the plains, the IMD declares a cold wave when the minimum temperature is 10 degrees Celsius or below and is 4.5 notches less than normal for two consecutive days.“However, for small areas such as Delhi, a cold wave can be declared if the criteria is fulfilled even for a day,” Kuldeep Srivastava, the head of the IMD’s regional forecasting centre, said.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, according to IMD officials.Clouds trap some of the outgoing infrared radiation and  radiate it back downward, warming the ground.The month of October was the coldest in 58 years in the national capital. The mean minimum temperature in October this year was 17.2 degrees Celsius, the lowest since 1962, when it was 16.9 degrees Celsius. 

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