According to the Met Office, the visibility at 8.30 a.m. was 400 metres. An official of the Northern Railway said at least 54 trains coming to the city were running late, while 11 trains departing from Delhi were rescheduled due to dense fog.

The minimum temperature settled two notches below the season's average at 6 degrees Celsius. Humidity at 8.30 a.m. was 91 percent. The Met office has predicted a chilly day ahead in the city.

"The sky will remain clear throughout the day...Light fog will return in the evening," said an official of the India Meteorological Department.

The day's maximum temperature is likely to hover around 17 degrees Celsius. Monday was the coldest December 22 in five years in Delhi as the minimum temperature dipped four notches below the season's average to 4.2 degrees Celsius, while the maximum settled at 15.8 degrees Celsius, six notches below the average.

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