The first published analysis of data from the most extensive rain gauge network in the city has thrown up some intriguing findings for the 2019 monsoon.
Unseasonal showers have enhanced the city’s air quality to the “satisfactory” level. Rarely do winter months witness such an improvement. Just two weeks ago, Mumbai had reported a poor to very poor air quality index (AQI), especially in pockets such as Colaba, BKC and Mazgaon.
December began on a wet note for Mumbaikars, with two new marks being set. While the city on Wednesday recorded its second- highest 24-hour rainfall ever for the month, the unseasonal showers sent the maximum temperature plunging by 9 degrees Celsius to its second-lowest for December in a decade.
The week began for the city with minimum temperatures dipping to 20 degrees. However, weather bureau officials said that the pleasant weather conditions are short-lived and a spike in temperatures can be expected again due to a low pressure area which is likely to form over East central Arabian sea, off Maharashtra coast, around Wednesday.
The month of November this year has recorded 30.1 mm of rains which is the second highest in a decade. The highest rains for the month were recorded in November 2019 of 109.3 mm while all the other years have seen less than 5 mm of rains.
The city recorded its second highest November rain in a decade in a 24-hour period ending 8.30am on Monday.
The city’s air quality index (AQI) which was in the ‘poor’ category at 269 on Wednesday dipped to 65 on Thursday, which is slotted in the ‘satisfactory’ category. Experts attributed this sharp drop to rain in the city which washed away the pollution.
Rains were witnessed in various parts of South Mumbai on the Diwali weekend. The suburbs saw some precipitation as well, but in significantly less measure.
In 2020 the IMD declared withdrawal of the south-west monsoon over Mumbai and the rest of Maharashtra on October 28. It saw the most delayed monsoon withdrawal over Mumbai since the IMD began maintaining its record in 1975.