Most parts of the state shivered due to the inclement weather on Wednesday.
Snowfall in many parts of neighbouring Uttarakhand added to the winter chill.
The lowest temperature on Tuesday was in Churk in Sonbhadra district where the mercury dipped to 1.8 degrees Celsius.
Officials said at least 21 people have died in the state since Tuesday. The casualties were reported from Ghazipur, Varanasi, Jaunpur, Chandauli, Etah, Bhadohi, Baghpat and Ballia.
Arrangements have been made for temporary shelters and bonfires for the homeless, the officials added.
At least 31 people had died across the state till Monday due to the intense cold, officials said.