India, Jan. 13 -- A cold wave swept the National Capital Region (NCR) on Monday as minimum temperatures dropped to a three-year low and some residents in south Delhi reported ground frost in their localities, with the India Meteorological Department (IMD) forecasting a chilly spell for another two days in the northern plains.

Safdarjung, representative of Delhi's weather, logged a minimum temperature of 3.2degC, 4.2 degrees below normal and the lowest for Delhi in January in three years. The last time it was colder in Delhi was January 18, 2023, which logged a minimum of 2.6degC.

Ayanagar recorded a minimum of 3.2degC too. It was 3.3degC at Palam and 3degC at Lodhi Road, the lowest in the Capital.

According to IMD, a cold wave requires...