A cold wave swept Delhi on Sunday as it recorded the coldest morning of the season so far at 3.4 degree Celsius, the India Meteorological Department (IMD) said.
"The observatory recorded a minimum of 3.4 degree Celsius, five notches below the normal, on Sunday morning," an IMD official said.
The mercury dipped to 3.3 degree Celsius at Lodhi Road.
On Friday, the minimum temperature had plunged to 2.7 degree Celsius at Jafarpur.
The city had recorded a "severe" cold day on Thursday as the maximum temperature dropped to 15.2 degree Celsius, seven notches below normal and the lowest this season so far.
However, it rose to 19.8 degree Celsius on Friday and 21.8 degrees Celsius on Saturday.
Meanwhile, the minimum temperature is expected to hover around 5 degree Celsius in the next five to six days.
According to the IMD, a "cold day" is when the minimum temperature is less than 10 degree Celsius and the maximum is at least 4.4 degree Celsius below normal.
A "severe" cold day is when the maximum temperature is at least 6.5 notches below normal.
The IMD declares a cold wave for the plains when the minimum temperature is 10 degree Celsius or below, and 4.5 notches less than normal for two consecutive days. However, for smaller areas, it is declared if the criteria are fulfilled even for a day.
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