The IMD defines a normal monsoon as one which delivers between 96 and 104 per cent of the 50-year average rainfall for the season.
The four-month monsoon season from June to September accounts for 75 per cent of rainfall in the country.
Operations at the Delhi airport remained normal. However, three flights were returned or diverted to the Delhi airport due to bad weather in Chandigarh, Varanasi and Lucknow on Tuesday night.
