Visibility was reported at 25 meters due to dense fog in Bareilly, Lucknow, and Gorakhpur on Tuesday. Visibility of 50 meters was reported at Ganganagar, Patiala, Baharaich, and Purnea, IMD said.
Delhi remained enveloped in a layer of fog on Friday morning whereas the low visibility hindered the traffic movement in the national capital.
Delhi's overall air quality stands in the 'very poor' category, according to the System of Air Quality & Weather Forecasting & Research (SAFAR).
The meteorological department had said that cold day conditions are very likely in isolated parts over Punjab, Haryana and Madhya Pradesh during the next 24 hours and it will improve thereafter.
According to Northern Railway officials, Cheenai-Hazrat Nizamuddin Duranto Express was delayed by 6 hours, followed by Puri-New Delhi Purushottam Express which was running behind schedule by 4 hours and 30 minutes.
The National capital, Delhi on Wednesday recorded a minimum temperature of 6.4 degrees Celsius, a notch below the season's average and humidity were recorded at 100 percent.
Delhi witnessed a chilly Friday morning as the minimum temperature dipping to settle at the season's average of 5.3 degrees Celsius. Some parts of the city witnessed dense fog causing at least 23 Delhi-bound trains delay by one to three hours.
A day after heavy downpour in several parts of North India, cold wave conditions with an overcast sky prevailed over most parts of Punjab, Haryana, and Chandigarh on Thursday. The severe fog led to the delay of at least 21 Delhi-bound trains by one to six hours.
According to northern railway officials, Raxaul-Anand Vihar Satyagrah Express was delayed by 8 hours, followed by Malda-Delhi Junction Farakka Express which is running behind its schedule by 5 hours and 30 minutes.
Amid bone-chilling winter in North India, Delhi NCR recorded a minimum of 8 degrees Celsius on Saturday morning and a sunny day is predicted ahead, the weather department said.
Delhi recorded an above normal maximum temperature for a second consecutive day on Thursday after remaining in the grip of a prolonged cold spell, the longest since 1992. The city recorded a high of 23 degrees Celsius, three notches above normal, and a low of 4.6 degrees Celsius, three degrees below normal.
Temperatures in Delhi and most parts of Uttar Pradesh have increased which has brought slight respite from the coldwave conditions. No improvement in visibility was, however, noticed which led to the delay of 21 trains in the North. The Delhi Traffic Police have issued a list of do's and don'ts to avoid accidents and vehicle pile up due to fog.
Delhi is witnessing the coldest December in years. Very dense fog covered the national capital region in the early hours of Monday, which led to a delay in the movement of several flights and trains, while 6 people died in a road accident resulting out of dense fog on the streets.
Delhi Weather Alert: Delhi and NCR witnessed extreme dense fog on Monday morning reducing visibility with the minimum temperature recorded at 4 degree Celsius at 7 am. Due to the thick blanket of fog, At least 30 trains are running late due to low visibility in the Northern Railway region
The minimum temperature in various parts of Delhi varied with 2.5 degrees Celsius being recorded at Ayanagar, 2.8 degrees Celsius at Lodhi Road, 3.2 degrees Celsius at Palam and 3.6 degrees Celsius at Safdarjung.
More than 100 trains were running late due to fog in Delhi which affected rail traffic under the Northern Railways with delays of up to two hours. Visibility dipped considerably due to the dense fog.
Due to low temperature and high humidity, the air quality was in the "severe" category in the morning. According to the Central Pollution Control Board (CPCB) data, Delhi's AQI at 8 am was at 430.
Transportation took a hit on Friday due to ongoing protests against the amended Citizenship Act. Over 100 trains were either cancelled or short terminated by Northeast Frontier Railway. Buses too did not ply in Guwahati, which has been the epicenter of the violence.