This is the lowest temperature recorded so far in the season.
The Palam airport logged the lowest visibility level of 200 metres at 5:30 am. Visibility dropped to 500 metres at the Safdarjung airport at 5:30 am, the IMD said.
According to the IMD, very dense fog is when visibility is between zero and 50 metres, between 51 and 200 metres is dense fog, between 201 and 500 metres is moderate fog, and between 501 and 1,000 is shallow fog.
The maximum temperature is likely to settle around 20 degrees Celsius during the day, the IMD said.