According to the MeT here, fog reduced visibility at many places in Punjab and Haryana early today.
At least five flights of private carriers to Delhi were delayed, officials said.
Rail traffic also took a hit with many trains running late or delayed by hours.
The Shatabdi Express train from New Delhi to Kalka via Chandigarh, which was to leave the national capital at 7:40 AM today, had been rescheduled to leave after a delay of about four-and-a-half hours due to fog at the originating station.
More From This Section
Amritsar recorded a low 2.2 degree Celsius, a degree below normal and was the coldest place in the two states, the MeT department said.
Patiala also witnessed a cold night at 7.4 degrees. However, Ludhiana's minimum settled within the normal range at 8.3 degree Celsius.
The minimum temperatures in Hisar and Narnaul in Haryana were recorded at 4.5 and 4.6 degree Celsius, both below normal.
Karnal's low settled at 6.8 degree Celsius while Ambala recorded a low at 8.5 degrees.
The MeT has forecast possibility of rain or thunder showers at few places in Punjab and Haryana tomorrow.