Punjab, Haryana, and western UP recorded the season's lowest minimum temperatures.
Visibility may drop below 50 metres on highways during early morning hours.
Higher reaches received fresh snow, boosting tourist footfall in hill stations.
Residents turned to bonfires and heaters as cold winds swept through the capital.
Operators advise passengers to check schedules before travelling in fog-hit regions.
A western disturbance may raise temperatures slightly after the current cold spell.
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