The unidentified man, who was found unconscious by passerby early this morning, was rushed to a government hospital in Subhash Chowk from Ghoda Nikas area of Ramganj where doctors declared him brought dead yesterday, they said.
The body has been kept in mortuary for identification, police said.
Jaipur experienced the coldest night of the season with 5.3 degrees Celsius, about 6 degrees less than normal. Churu recorded the lowest temperature of 2.4 degrees Celsius.
Meanwhile, due to fog in neighbouring states of Punjab, Haryana, Delhi and Uttar Pradesh, seven passenger trains of North-Western Railway were running late in Rajasthan from 30 minutes to 5 hours and 10 minutes since yesterday, its CPRO Tarun Jain said.
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The Hawarah-Sriganganagar train is running 5 hours and 10 minutes late, and Varanasi-Jodhpur train by 5 hours.
Elsewhere, the minimum temperature was below ten degrees Celsius at many places including Sriganganagar, Barmer, Jaisalmer, Jodhpur, Sikar, Kota, and Bikaner.
No respite in present cold weather conditions is expected in next 24 hours in the state, a forecast said.