Dense to very dense fog occurred at some places over Uttar Pradesh, Haryana, Chandigarh and Delhi, Rajasthan and Madhya Pradesh. Shallow to moderate fog occurred at isolated places over Assam, Meghalaya, Jharkhand, Bihar, west Uttar Pradesh and Punjab, the MeT department said.
Mainly clear skies prevailed in the national capital even as dense fog was witnessed in early morning hours affecting the movement of rail traffic leading to delay in schedule of 84 trains and rescheduling of 37 others.
Additional Superintendent of Police of Greater Noida, Abhinandan said the accident took place on Yamuna Expressway in Ecotech 3 police station area early this morning.
Due to low visibility, a car rammed into a tractor-trolley, leading to a pile-up involving 12 vehicles.
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Mathura-resident Pankaj died on the spot and around 10 others sustained injuries.
In Jammu and Kashmir, Leh recorded 1.5 degrees Celsius, 6 notches above the previous night's 8.2 degrees Celsius, even as mercury rose at many places but the Valley continued to reel under freezing temperatures.
Srinagar, the summer capital of the state, witnessed a low of minus 4.4 degrees Celsius.
The MeT official said there is possibility of light rain or snowfall at isolated places over higher reaches of Kashmir Valley over the next 24 hours.
Kashmir is currently under the grip of 'Chillai-Kalan' considered the harshest period of winter, when the chances of snowfall are most frequent and maximum and the temperature drops considerably.
'Chillai-Kalan', which, began on December 21, ends on January 31 next year, but the cold wave continues even after that.