Two people died in Hardoi where a tractor trolley was hit by a train at the railway crossing while two others died in Lakhimpur Kheri district due to poor visibility because of heavy fog.
MeT office here said that moderate to dense fog occurred at most places over east UP and moderate fog occurred at isolated places in western parts of the state.
Yesterday, night temperatures appreciably rose in Moradabad division; rose in Varanasi and Allahabad divisions; fell in Kanpur, Jhansi, Agra divisions and changed a little in the remaining divisions of the state.
Lowest minimum temperature over the state was 5.5 degrees Celsius recorded at Muzaffarnagar, they added.