As many as 45 north-bound trains were delayed and 24 others rescheduled due to fog.
Dense fog occurred at isolated places in West Bengal and Sikkim, Odisha, Uttar Pradesh, Haryana, Chandigarh and Punjab, while shallow to moderate fog occurred at isolated places over Bihar and east Rajasthan in the morning hours.
Three persons were killed and one was injured their car dashed into a truck which was parked on the roadside near Baas village in Hisar district of Haryana last night, police said, adding low visibility due to fog is stated to have led to the mishap.
There were some minor delays in flight operations because of the weather but there was no cancellation or diversion due to visibility, an airport official in Delhi said.
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The minimum temperature in Delhi was recorded at 8.6 degrees Celsius, normal for this time of the year, while the maximum temperature settled at 23.2 degrees Celsius, a notch above season's average.
Night temperatures in Kashmir registered a remarkable improvement to settle above freezing point but the high altitude areas, which recorded heavy snowfall last month, continue to reel under freezing temperatures, a MeT official said.
Leh was followed by nearby Kargil where the night temperature settled at minus 10.4 degrees Celsius against yesterday's minus 11.2 degrees Celsius.
The famous hill resort of Pahalgam in south Kashmir, which serves as the base camp for annual Amarnath yatra, registered an improvement of four degrees in the minimum temperature which settled at minus 3 degrees Celsius.
Night temperature in the famous ski resort of Gulmarg plummeted to minus 7.6 degrees Celsius from minus 6 degrees Celsius yesterday. Srinagar also recorded a dip in the night temperature by one notch, which settled at 0.9 degrees Celsius.