Cold wave has tightened its grip over North India with fog disrupting road, rail and air traffic in the region.

Delhiites woke up to a cold morning today with the minimum temperature hovering around eight degree Celsius while a dense layer of fog covered the city in the early hours.

Dense fog also enveloped many parts of Punjab, Haryana and Chandigarh today affecting normal life even as bitter cold persisted in the region.

Railway sources said that fog affected normal movement of trains passing through the two states and many were delayed by hours.

In J&K, cold wave conditions continued unabated in Kashmir Valley with minimum temperatures remaining several degrees below the freezing point.

Meanwhile, the month-long dry spell in the Valley may soon end as the weather department has forecast rain and snowfall in parts of the Valley over the next three days.

The Met department has issued an advisory warning that land and air transport systems of the state may be disrupted as the western disturbances, which cause rains and snowfall, over the state are likely to intensify.