Delhi is bracing for another phase of near cold wave conditions in the coming days. The minimum or night time temperature in the capital rapidly fell between November 16 and November 24, reaching up to 6.3 degrees Celsius and marking a 17-year low for the current month.
A cold wave is declared when there’s a significant drop in minimum or night time temperature.
The IMD’s criteria for a cold wave in the plains is that the minimum temperature should be 10 degrees or lower and the departure from normal minimum temperature 4.5 degrees or less for two consecutive days.
One of the main reasons is snowfall in high altitude areas north of Delhi, including places in Jammu and Kashmir, Himachal Pradesh, and Uttarakhand.
Cold winds blowing from these areas lower temperature across northwest India every winter, including Delhi.