Cold wave continued unabated in the national capital on Friday, with the minimum temperature settling three notches below normal.
Twenty-one trains were delayed for a maximum of six hours in the north due to weather conditions.
Met officials said the mean maximum temperature (MMT)- the average of each day’s maximum — so far this month is 19.5 degree celsius.
"The minimum temperature was recorded at 4.2 degrees Celsius, three notches below normal," a meteorological department official said.
The humidity level was recorded at 86 per cent.
With a numbing cold continuing to sweep Delhi-NCR, the region is expected to record its second-coldest December since 1901, the weather department said.