The entire North India reeled under an intense cold wave on Wednesday as a drop in the mercury level claimed 15 more lives in Uttar Pradesh, with a thick fog cover throwing normal life out of gear at many places in the region. Delhi witnessed its coldest day of January in the past 44 years with the maximum temperature falling sharply by 11 notches to stand at 9.8 degrees Celsius. Residents woke up to a foggy morning with the minimum temperature dipping by two notches below normal to stay at 4.8 degrees Celsius. Poor visibility affected schedules of nearly 30 flights and led to diversion of an international flight to Mumbai. In Uttar Pradesh, the death toll continued to mount, with 15 more people succumbing to the chill in various parts of the State. Officials said four people died in Muzaffarnagar which remained the coldest place at 0.6 degree Celsius, followed by three in Mathura, two each in Agra, Bulandshahr, Etah and one each in Barabanki and Mirzapur. With this, the death toll in the State this winter has gone up to 107. Night temperatures remained below normal in most parts of the State including Moradabad, Agra, Meerut, Gorakhpur, Lucknow, Bareilly and Kanpur divisions. Himachal continued to reel under sub-zero temperatures, with Keylong remaining the coldest place at a minimum of minus 8.9 degrees Celsius, followed by Kalpa with minus 3.5 degrees Celsius. While the key tourist resort of Manali shivered at minus 3 degrees, capital Shimla recorded a low of 2.1 degrees Celsius. According to the weatherman, early morning fog engulfed many parts of the State but visibility improved as the day advanced. The cold wave swept Rajasthan, too, where Churu was the coldest place with a minimum temperature of 1.6 degrees Celsius, followed by Pilani with 2.6 degrees Celsius. Bikaner, Sriganganagar, Jaipur, Dabok and Jaisalmer recorded night temperatures of 4, 4.5, 5.2, 6.4 and 6.5 degrees Celsius respectively while other stations recorded minimum of 7 and 8 degrees Celsius. Punjab and Haryana also remained in the grip of severe cold, with the mercury dropping by up to three notches below normal in various parts. Dense fog and mist resulted in low visibility, causing disruption of rail, road and air traffic. Narnaul in Haryana remained the coldest place in the region with a minimum of 2.4 degrees Celsius, down three notches below normal.d