"The minimum temperature was recorded at 5.2 degrees Celsius, two notches below normal. Humidity was recorded at 97 per cent," a MeT official was quoted by news agency Press Trust of India.
The India Meteorological Department (IMD) said the minimum temperature was expected to be 4 degrees Celsius on Wednesday, while the maximum temperature on Tuesday was likely to hover around 17 degrees.
"The sky will remain clear with mist and shallow fog in some isolated places in the morning. The day will be cold and difference between maximum and minimum is set to reduce," an IMD official was quoted by news agency IANS.
The IMD forecast no rain and predict the cold wave was likely to mallow down from January 13 onwards.
The visibility at 8.30 am was 1,200 metres at Safdarjung and 250 metres at Palam. The humidity was 97 per cent.
The cold wave in North India has also hit train services. At least 21 trains were running late and seven cancelled due to dense fog in parts of north India, a railway official said.
The cancelled trains included New Delhi-Hyderabad Telangana Express, Jammu Tawi- Bhagalpur Amarnath Express, Jaynagar-Amritsar Saryuyamuna Express, New Delhi-Rajgir Shramjivi Express, Kota-Patna Express, New Delhi-Bhubhneswar Rajdhani Express and Amritsar-Kanpur Central Express.
However, flight operations at Indira Gandhi International Airport were reported to be normal.
The MeT has predicted a clear day with possibility of mercury settling at 17 degrees Celsius.
Yesterday, the maximum and minimum temperatures were recorded at 19.3 degrees Celsius and 8.6 degrees Celsius respectively.
(with inputs from agencies)