The national Capital on Monday experienced the coldest day of the season so far with the mercury dipping to 6.6 degrees Celsius, a notch below the season's average.
Moderate foggy conditions were witnessed in the morning which resulted in delay of 40 trains, according to a senior railway official.
"The minimum temperature which was recorded at Safdarjung observatory, considered the official for Delhi, was down from Sunday's low of 7.2 degrees Celsius," said a Met official.
The minimum temperature at lodhi Road observatory was 5.4 degrees Celsius even as Palam registered 7.6 degrees. In Ridge and Ayanagar, the minimum temperature was 9.5 and 7.5 degrees respectively.
Visibility was recorded at 1,800 metres at 5.30 am both at Safdarjung and Palam at 5.30 am. It dropped to 400 metres at 8.30 am in both the places before improving to 1,000 metres three hours later, the official said.
The relative humidity oscillated between 40 and 97 per cent. The weatherman has predicted mainly clear skies for Tuesday with the likelihood of some mist and shallow fog.
Maximum and minimum temperatures are expected to be around 23 and 9 degrees Celsius, respectively.
On Wednesday, minimum and maximum temperatures were recorded at 7.2 degrees Celsius and 23 degrees Celsius, respectively.
At least 24 trains were delayed and one cancelled on Monday due to dense fog in most parts of north India, a railway official said.
The Northern Railway official said the Jogbani-Anand Vihar Express was running over 13 hours behind schedule, the Swatantrata Senani Express was 15 hours late and the Shaheed Express was over 11 hours late.The official also said that at least five trains were rescheduled.