Charlie Knight, Radcliffe Meteorological observer, described the findings as “remarkable” especially when considering that most of the months rainfall fell across two days.

He said: “This exceptional amount of rainfall is particularly unusual given that September is typically not a very wet month, averaging 52mm of rain.

“Only about one year in 10 is it the wettest month of the year.”

Nearby Environmental Agency (EA) gauges support the Radcliffe rainfall totals, with one gauge at Osney Lock recording 101.1 mm in just under 23 hours on 23 September.

The Radcliffe Meteorological Station, managed by the university’s School of Geography and the Environment, holds the longest series of temperature and rainfall records for one site in Britain.