As many as 55 flights were delayed due to fog at Delhi airport and three international flights were diverted, while more than 80 trains were running late in the region.
The national capital, recorded the lowest temperature in the past five years with the mercury dipping to 2.6 degrees Celsius, five notches below normal. The maximum stood at 19.2 degrees Celsius, one notch below normal.
Jammu and Kashmir too continued to reel under intense cold with the mercury in the state's summer capital Srinagar settling at minus 4.7 degrees Celsius and Leh recording the season's coldest night so far.
Leh, in the frontier Ladakh region, recorded a minimum temperature of minus 17.0 degrees Celsius, a further drop from the previous night's minus 16.4 degrees Celsius. Kargil, with a low of minus 15.2 degrees Celsius, was the second coldest place in the state after Leh.
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Srinagar witnessed the coldest night of this season so far with the mercury plunging to minus 5.6 degrees Celsius the previous night. Severe cold has led to the freezing of parts of many water bodies including the famous Dal Lake located in the heart of the city.
Meanwhile, bone-chilling cold wave conditions continued to sweep across Punjab and Haryana with Chandigarh recording the coldest night of the season so far at 2.3 degrees Celsius, five notches below normal.
In Haryana, Hisar shivered at 3.1 degrees, while Ambala's minimum settled at 3.5 degrees. In Punjab, Amritsar, Ludhiana and Patiala, which were covered by fog in the morning, also continued to be under the grip of biting cold with the mercury dipping to 3.6, 3.7 and 3.6 degrees Celsius, respectively.