Cold to severe cold conditions are likely to persist on Sunday in most pockets in Punjab and several in Haryana, Chandigarh and Delhi along with in some places in Uttar Pradesh and Bihar, according to the Met Department.
Mercury fell to a minimum of 2.4 degrees in Faridabad and Gurugram, located in Delhi NCR. Chandigarh recorded a minimum temperature of 5 degrees.
However, temperatures have risen by 2-3 °C at many places over UP, Haryana, Chandigarh and Delhi, temperature risen by 1-2 °C at many places over Bihar and temperature risen by 0.5 °C-1 °C at few places over Madhya Pradesh and isolated places over Rajasthan, according to the India Meteorological Department (IMD).
Temperatures have also fallen by 1-2 °C at few places over West Rajasthan and West Madhya Pradesh.
Cold wave to severe cold wave conditions very likely in many pockets over Haryana, Chandigarh and Delhi, as per the Met Department's forecast. This may bring the mercury down further.
Dense to very dense fog is expected in some pockets in Uttar Pradesh, Punjab, Haryana, Chandigarh and Delhi.
Meanwhile, the national capital's air quality remained in the 'very poor' category at 392 as of 8:30 am.
The India Meteorological Department has issued a red-coded warning for Punjab, Haryana, Delhi, Rajasthan, Uttar Pradesh and Bihar, and amber-colour warning for Madhya Pradesh for Sunday. A red-coded warning is given for extreme weather events.
The frigid air barrelling through north India plummeted temperatures to season's lowest in Delhi and neighbouring states on Saturday with many places recording a minimum of below two degrees Celsius, as dense fog reduced visibility and disrupted air, rail and road traffic.
Authorities were forced to divert four flights from Delhi airport to other destinations on Staurday. An airport official said pilots were operating under CAT-IIIB conditions, meaning the runway visuality range (RVR) was between 50-175 metres.
A railway official said 24 trains were delayed by 2-5 hours due to poor visibility, including the Howrah-New Delhi Poorva Express.
(With inputs from agencies)