The Chennai district received close to 400 mm of average rainfall in two days — between the 24-hour period ending at 8.30 am on December 4 and the 24-hour period ending at 8.30 am on December 5 — according to TNSDMA. In the district, ward 169 in Perungudi registered the highest average rainfall of 293.4mm, followed by CD Hospital (ward 43) in Tondiarpet (233.6 mm) and ward 111 in Nungambakkam (223 mm). Of the 43 stations in the city, 17 recorded over 200 mm of average rainfall in the two days. In 22 stations <200 mm but >150 mm was recorded and only four stations received less than 150 mm rainfall.
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If stations around the Chennai district were also considered, Avadi (278.2 mm) and Poonamalle (241.3 mm) followed Perungudi. These figures show that all parts of the city and its surroundings were battered.
