After a week's respite from the chill, temperatures dropped once again on Sunday night to 4.8 degree Celsius, three degrees below normal.
HT ImageThe chill, unaccompanied by the fog, did little to affect rail and air travel.
Airline officials said that all morning flights from Delhi had departed on time.
A few Delhi-bound trains were running behind schedule, but these were stated to be routine delays.
The GT Express, scheduled for arrival in New Delhi from Chennai was late by eight hours, a Northern Railway statement said.
The Delhi-bound Malda Farukka Express from Malda Town was also running behind by six and a half hours.