Assistant Meteorologist A S Khan told PTI that the city had witnessed a minimum of 5.5 degree Celsius in 1968 on December 29.
Nagpur and adjoining areas have been experiencing extreme cold conditions since last two days when mercury dipped to 6.1 and 5 degrees, Khan said.
The cold wave is expected to continue for three more days and temperatures may change rise only after January 1, he added.