Minimum (night) temperatures fell below normal by about 4 deg Celsius in pockets of Haryana and West Uttar Pradesh overnight on Wednesday.
Mercury dips in the manner as cool Arctic air blows into the region as north-westerlies.
It takes a warm western disturbance to break the chill and bring some respite.
One such is waiting over north Pakistan, and has already made its presence over parts of Gujarat and south Rajasthan on this side of the border.
Clouds associated with the western disturbance ensured that some solar radiation was retained on ground, making it relatively warmer in these parts.
Night temperatures looked up by 2 to 4 deg Celsius over many parts of Gujarat and some parts of south Rajasthan during the 24 hours ending in the morning.
Lowest minimum temperature of 3.8 deg Celsius was recorded at Adampur in Punjab.
The India Meteorological Department (IMD) has forecast rain or snow over Jammu and Kashmir and Himachal Pradesh in view of incoming western disturbance.
No significant change in minimum temperatures is expected over north-west and adjoining central and east India on Thursday.
The IMD has also forecast the possibility of the arrival of a fresh western disturbance in the western Himalayan region over the next week.
In the South, clouding associated with a trough of lower pressure each in the Bay of Bengal and the Arabian Sea kept up mercury in north interior Karnataka, Telangana and coastal Tamil Nadu.
Meanwhile, rain or thundershowers has been forecast to continue at many places over coastal Andhra Pradesh and Rayalaseema on Thursday.
The persisting trough in the Bay of Bengal continued to bring in moisture-laden easterly winds deeper into central peninsula.
Rain has been forecast for Telangana, Karnataka, Tamil Nadu, Kerala and Lakshadweep.
One or two places over Odisha, south Chhattisgarh, Maharashtra and Goa may also benefit in this manner.
Moderate to heavy rain occurred at many places over south Andhra Pradesh, north Tamil Nadu during the 24 hours ending on Wednesday morning.
Nellore recorded 11 cm of rain and Tirupati 7 cm during this period, the IMD said.