RAIN lashed Delhi-NCR throughout Friday with the city recording its highest December rainfall in the last 15 years and the mercury dropping sharply to 14.6 degree Celsius, the weather department said. The rain began late Thursday around 2.30 am and continued throughout the day, it said. According to Indian Meteorological Department (IMD) data between in the last 24 hours till 8.30 am on Friday, the city logged 9.1 mm of rainfall. The observatory at Safdarjung -- the national capital’s primary weather station -- recorded an additional 30.2 mm of rainfall between from 8.30 am to 5.30 pm on Friday, as per the data. The total rainfall for December stands at 42.8 mm, marking the highest rainfall this month in the last 15 years, based on data from 2009 to 2024 available on the weather department’s website. Meanwhile, the all-time highest December rainfall was recorded in 1884, when the city received 134.4 mm of rain. The observatory at Palam registered 31.4 mm rainfall, 34.2 mm in Lodhi Road, 33.4 mm in Ridge, 39 mm in Delhi University and 35 mm in Pusa till 5:30 pm on Friday.