A highly unusual monsoon season this year has yielded over 1,100 mm of rainfall in Delhi so far, the highest in 46 years, the India Meteorological Department (IMD) said Saturday.  Normally, Delhi records 648.9 mm of rainfall during the monsoon season, according to the IMD.

Parts of the Indira Gandhi Airport International Airport (IGIA) in New Delhi was waterlogged following record rain in the national capital, NDTV said. An 'orange alert' has been issued as the monsoon rainfall in Delhi breached the 1,000 mm mark on Friday, the highest annual rainfall in 46 years. The continuous rain caused waterlogging in several parts of Delhi.

"The Safdarjung Observatory, which is considered the official marker for the city, had gauged 1,150 mm of rainfall in the 1975 monsoon season. This year, the precipitation has already hit the 1,100-mm mark and the season has not ended yet," an IMD official told news agency Press Trust of India.

"Light to moderate rain is likely in the next two days. Another wet spell is predicted around September 17-18," the official said.

It has been a bountiful September for Delhi, with 343.6 mm of rainfall recorded so far this month, which is the highest in at least 12 years, according to data available on the IMD's website.

Delhi recorded more than 100 mm of rainfall on two consecutive days at the start of the month - 112.1 mm on September 1 and 117.7 mm on September 2. On Saturday (September 11), it recorded 94.7 mm precipitation. Despite the monsoon embracing Delhi only on July 13, making it the most delayed in 19 years, the capital had recorded 16 rainy days in the month, the maximum in the last four years.