Dense fog occurred at isolated places of Assam, Meghalaya, Odisha and Punjab, while Haryana, Chandigarh and Delhi witnessed shallow to moderate fog in the morning hours.
35 trains were delayed, four cancelled and 10 others rescheduled due to fog in the northern states, a railway official said.
It was a pleasant day in the national capital with the sky remaining generally overcast, while the morning was foggy. The minimum and maximum temperatures were registered at 11.9 degrees Celsius and 23.2 degrees Celsius respectively.
The Srinagar-Jammu highway, the only all-weather road link connecting Kashmir Valley with the rest of the country is closed for traffic as a result of muck accumulated on the road due to landslides, which occurred near Ramban and Battery Cheshma, an official said.
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The weather in Kashmir remained dry but the Meteorological Department has forecast scattered to fairly widespread rains or snowfall in the state till tomorrow.
Srinagar recorded a low of 1 degree Celsius, a remarkable improvement after the 40-day harshest winter period, Chillai-Kalan, ended on January 31.
Leh town in Ladakh region registered a low of minus 4.6 degrees Celsius, making it the coldest recorded place in the state, a MeT official said.
In Himachal Pradesh, barring high altitude tribal areas which experienced mild snowfall, the weather remained dry, even as the sky remained heavily overcast in Shimla and other parts of the state and strong winds swept the region, causing marginal drop in maximum temperatures.
Keylong and Kalpa in tribal Lahaul and Spiti recorded a low of minus 4.6 degrees Celsius and zero degree Celsius, followed by Manali 4 degrees Celsius, Dharamsala 7.8 degrees Celsius and Shimla 9 degrees Celsius.
People in Punjab and Haryana got respite from cold conditions with minimum temperatures settling above normal at many places.