Three people each died in Ballia, Lalitpur and Sonebhadra districts, followed by one each in Barabanki, Mirzapur, Kushinagar and Hathras, officials said.
Met office sources said that the maximum temperatures recorded were below normal by 5 to 10 degree Celsius over many parts of the state.
Night temperatures fell markedly in Gorakhpur, Varanasi, Allahabad divisions and fell in Kanpur, Lucknow divisions.
Lowest temperature of 1.4 degree Celsius was recorded at Kanpur followed by Muzaffarnagar 1.6 deg , Najibabad (Bijnore) 1.6 deg, Agra and Lucknow 2.1 deg and Kheri 2.6 deg C.
The local Met department forecast dry weather and dense fog over many parts of the state, which would bring down the visibility to 50 metres or less, in the next two days.