Frigid conditions showed no signs of abating as mercury hovered several notches below normal in north India and thick fog enveloped the region throwing normal life out of gear.
Delhiites witnessed a thick fog blanket in the wee hours of the morning that led to several cancelled or delayed flights and trains to and fro in the city.
Srinagar residents of Kashmir Valley were digging out from 2.3 mm of snow that fell overnight with temperature plummeting further two notches to minus 2.3 degree Celsius.
Foggy conditions disrupted normal life in Rajasthan affecting rail and road traffic where vehicles were moving at a snail's pace and some trains running behind the schedule.
Intense cold wave sweeping across Punjab, Haryana and Chandigarh continued unabated in most parts with mercury dropping to record-breaking minus 2.1 degree Celsius at Hisar.
Flight and train operations were adversely affected due to lack of visibility with 37 trains, mostly Delhi-bound, running late by several hours and delay or diversion of around 150 domestic and international flights causing inconvenience to passengers.
In a fog-related incident, at least 10 vehicles rammed into each other on Delhi-Jaipur national highway at Chandwaji, 100 kms from Jaipu.
Fog engulfing the northern region caused delay in premier trains like Rajdhani, Duronto and Shatabdi trains. Rajdhani trains coming from Guwahati, Ranchi, Patna, Howrah, Mumbai and Bhubaneswar ran late by three to five hours.
Services of Sealdah Duronto and Kanpur Shatabdi were also affected because of the low visibility due to dense fog.
In the early morning hours, around 51 domestic and international flights departing from the capital and 39 scheduled to arrive here were cancelled. While 52 incoming flights were diverted to Amritsar, Lucknow and other cities.
The minimum temperature in Delhi settled down at 6.4 degree Celsius, one degree below normal and the maximum temperature was recorded at 19.3 degrees Celsius which was one notch below normal.
Amritsar and Adampur in Punjab also reeled under intense cold recording respective minimums of 0.3 deg C and 1.5 deg C.
The famous ski-resort of Gulmarg in Kashmir Valley registered a low of minus 9.7 degrees Celsius, as against the previous night's minus 9.8 degrees Celsius.
Leh, in Ladakh region, recorded a low of minus 7.9 degrees Celsius against the previous night's minus 8.6 degree Celsius.
The mercury in Kargil settled at a low of minus 13.1 degree Celsius, three degrees up from minus 16.1 degree Celsius the previous night.
Meanwhile, the Srinagar-Jammu national highway, the only road-link connecting Kashmir Valley with the rest of the country, is open for traffic.
Churu in Rajasthan recorded a night temperature of 1.6 degrees C, while Pilani and Chittorgarh recorded a minimum of 2.5 and 5.7 degrees Celsius respectively.