New Delhi, Dec 31: Delhiites shivered in the morning as the mercury plummeted to the season's lowest today even as dense fog affected air traffic.
The minimum was recorded at 5.5 degree Celsius, two degrees below normal and down from yesterday's 7.7 degrees.
The dense fog that enveloped the city in the morning hours created troubles for commuters.
Around 40 flights operating from Indira Gandhi International Airport were either rescheduled or cancelled due to dense fog enveloping the airstrip.
Overnight around 16 flights were delayed. Around five flights were cancelled either due to operational reasons or due to poor weather, an airport official said.
Fog started to descend on the airport from last night but it started to become dense around 7 AM, forcing authorities to implement low visibility procedures.
Dense fog returned to the capital yesterday after a four-day lull, affecting over 130 flights.