Jaipur, Jan. 6 -- Severe cold conditions and dense fog continued to disrupt normal life across Rajasthan, forcing authorities to declare school holidays in several districts, while minimum temperatures plunged sharply in many parts of the state. Dense fog was reported in Jaipur, Kota, Sikar, Udaipur and Nagaur on Monday morning, with visibility in Sikar dropping to just 50 metres. In several cities, vehicles were seen plying on highways with headlights on until around 9am. Flight operations were also affected, with at least four flights to and from Jaipur running late. Minimum temperatures remained alarmingly low, intensifying the cold wave. According to the Meteorological Centre, Jaipur, Vanasthali (Tonk) in eastern Rajasthan recorded the lowest minimum temperature at 4.1 degree Celsius, while Sri Ganganagar in western Rajasthan recorded 5.4 degree Celsius. Sikar registered a minimum of 5.5 degree Celsius, Jaipur 6.8 degree Celsius, Pilani 7 degree Celsius and Churu 8 degree Celsius, marking one of the coldest spells of the season. Cold conditions were also severe in other regions. Ajmer recorded a minimum temperature of 5.8 degree Celsius, while Sawai Madhopur dipped to 5.6 degree Celsius. Jhunjhunu recorded 8.3 degree Celsius and Fatehpur 7.5 degree Celsius. In southern Rajasthan, Udaipur's Dabok station recorded a minimum temperature of 7.6 degree Celsius, while Sirohi stood at 5.4 degree Celsius. The hill station of Mount Abu recorded a minimum temperature of 4.4 degree Celsius. In view of the biting cold, district administrations announced school closures. In Hanumangarh, holidays for students from Class 1 to Class 8 in all government and private schools have been extended till January 10. In Sri Ganganagar, schools from nursery to Class 5 will remain closed till January 12, while classes for students from Class 6 to Class 12 will be held between 10.30am and 3pm. In Bundi, schools up to Class 8 will remain closed on January 6 and 7, while in Pratapgarh, holidays have been declared for students up to Class 8 from January 6 to 8. Kota and Baran witnessed chilling conditions resembling night-time cold, with maximum temperatures dropping below 14 degree Celsius. The Meteorological Department said that in many parts of the state, night temperatures remain 2 to 6 degree Celsius below normal. It warned that minimum temperatures may fall by another 1 to 2 degree Celsius over the next two to three days, especially in northern Rajasthan....