A dense fog has gripped Delhi and its neighbouring areas, affecting road, rail and air traffic in the region. In Delhi -- where the weather office has sounded a "red" alert -- commuters were seen driving with emergency lights as the visibility on city roads plummeted below 50 metres.
Thirty trains that are either originating or scheduled to arrive in Delhi have been affected due to the dense fog.
The average maximum temperature this month is likely to be 19.15 degree Celsius. If it happens, then it will be the coldest December since 1997 when it was 17.3 degree Celsius, and the second-coldest December since 1901.
Only on four occasions between 1901 and 2018, the average maximum temperature for December has been either equal to or less than 20 degree Celsius in 1919, 1929, 1961 and 1997.
