Delhi, the India Meteorological Department said on Friday.The Safdarjung Observatory, which provides representative data for the city, has recorded a minimum temperature of 4.4 degrees Celsius.Also Read | Covid curve slumping across IndiaThe Palam weather station registered a low of 3.4 degrees Celsius.Delhi had recorded a "severe" cold day on Thursday as the maximum temperature dropped to 15.2 degrees Celsius, seven notches below normal and the lowest this season so far.A "cold day" is when the minimum temperature is less than 10 degrees Celsius and the maximum temperature is at least 4.4 degrees Celsius below normal.A "severe" cold day is when the maximum temperature is at least 6.5 notches below normal."Cold wave" conditions are.