May saw second-highest rainfall in 121 years; no significant heat wave spell: IMD

May received the second-highest rainfall in 121 years, the India Meteorological Department (IMD) said in its monthly report Thursday, attributing two back-to-back cyclones and western disturbances for the record precipitation.

It also said that at 34.18 degrees Celsius, the average maximum temperature over India this May was the fourth lowest since 1901.

The lowest ever temperature recorded for May was 32.68 degrees Celsius in 1917. The temperature was lowest since 1977 when it was of 33.84 degrees Celsius, the IMD said.

There was no significant heatwave spell observed during the month over any parts of India, he said.

Rainfall over the country as a whole for the month of May 2021 was 107.9 millimetres, which is 74 per cent more than its Long Period Average (LPA) of 62 mm.

"Rainfall over India during the month of May was second-highest since 1901. The ever highest rainfall occurred in the year 1990 (110.7mm)," the IMD said in its monthly report for May.

Read | India to receive 101% rainfall, normal rainfall in most parts barring NE

May saw the formation of a cyclone each in the Arabian Sea and the Bay of Bengal.

Cyclone Tauktae formed over the Arabian Sea and developed into an 'extremely severe cyclonic storm'. It hit the Gujarat coast on May 17 after battering states along the western coast.

Cyclone 'Yaas' developed over the Bay of Bengal and intensified into a 'very severe cyclonic storm'. It hit the Odisha coast on May 26 and also affected West Bengal.

These two systems brought rainfall not only over the states along the western and eastern coasts but also to other parts of the country. For instance, as Cyclone 'Tauktae' weakened, it headed towards north India and brought rains over several parts of north India.

Similarly, ‘Yaas’ brought rains over east India including Jharkhand, Bihar as it weakened.

The IMD said that in all three months of the summer of 2021, frequencies of western disturbance activities over north India were higher than normal.

In March, April and May 2021, it was seven, nine and eight respectively against normal of 4-6 WDs, the IMD added.

Western disturbances are cyclonic storms that originate in the Mediterranean, traverse across Central Asia and hit north India. They are critical to northwest India as they are a major source of snow and rainfall during the winters.

Like in March and April 2021, heatwave conditions in May 2021 was occasional and also for shorter periods over very small region.

"No significant heatwave occurred during the month over the country except northwest Rajasthan where it was observed for two days on May 29 and 30,” the IMD said.