Most places in the state experienced dense to very dense fog, with the state capital witnessing cloudy skies throughout the day, MeT department said.
Night temperatures fell in Varanasi, Allahabad and Moradabad divisions and changed little in the remaining divisions of the state.
The lowest minimum temperature in the state was recorded at 3.2 degrees Celsius in Najibabad (Bijnore).
MeT department has forecast that dense to very dense fog would occur at a few places and the cold conditions would prevail.