According to MeT department, minimum temperature was recorded at 6.8 degrees Celsius, which was one notch below normal.
An official of the department said that shallow fog was witnessed in the national capital in the early hours and visibility was recorded at 500 meters at 8:30 AM while humidity levels were registered at 94 per cent till 8.30 AM this morning.
According to Northern Railways, 52 trains are also running late by several hours due to dense fog.
Trains like Shram Shakti Express, Sampoorna Kranti Express, Vaishali Express, Chhattisgarh Express are also running late.
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Premier trains like Rajdhani and Duronto Express are also running late.
However, according to airport authorities, no flight operation was delayed on account of weather.
Weatherman has predicted mainly clear sky later in the day.
"There will be mainly clear sky throughout the day and the maximum temperature is expected to settle around 15 degrees Celsius," a MeT official said.
Yesterday, the maximum temperature had settled six notches below the season's average at 14.5 degrees Celsius while the minimum temperature was recorded at 7.2 degrees Celsius.