Mumbai this year received 156 per cent more rainfall than the average of June and July, which are 493.1 mm and 840.7 mm, respectively. But excess rainfall in the city is not new anymore, according to the IMD. Mumbai got 25 per cent excess rain in four out of the past five years. In 2019 and 2020 alone, the cumulative monsoon rain exceeded 160 per cent.

Extreme rainfall in a short period of time has been a talking point for some time now. The Santacruz observatory of the India Meteorological Department (IMD) recorded over 200 mm rainfall each on three days this year. The data shows that along with the number of days of extremely heavy rain, the cumulative rainfall over the city has also been increasing.