More rain fell in Philadelphia on the first day of June than in all of May and set a new record for the date in the process.
Low cloud cover in the meantime is delaying some flights to Philadelphia International Airport by an average of 48 minutes, the FAA said. Flights to LaGuardia from Philadelphia also were delayed.
The National Weather Service said 1.96 inches of rain fell on Monday at Philadelphia International Airport, breaking the record of 1.58 inches set for the date in 1881.
A total of 1.15 inches was measured there in May.
Records also were set Monday in Wilmington, where the 3.80 inches easily broke a record of 1.69 inches set in 1952, and in Atlantic City, where the record of 0.93 inches set in 1979 sank under 2.22 inches of rain.
The totals do not include any rain that fell after midnight.