Churu on the plains was the coldest place with a minimum temperature of 3.2 degrees Celsius.
The minimum temperature in Bikaner was recorded at 3.6 degrees while Mount Abu's low settled at 4.4 degrees Celsius.
The minimum temperature at Pilani and SriGanganagar was recorded at 4.8 and 6.2 degrees Celsius respectively.
Jaipur's low settled at 6.3 degrees while the night temperature in Dabok was recorded at 7 degrees Celsius.
The minimum temperature at Jaisalmer, Sikar and Jodhpur was recorded at 7.2, 7.5, and 8.3 degrees Celsius respectively.
The trains are running late from few minutes to up to 14 hours, he said.
Nine flights were also delayed due to the fog in the early hours, Sanganer airport sources said.