The phrase "record rainfall" means that the amount of rain that fell is the highest or most ever recorded in a particular area or time period. Full definition
If it was supposed to cause all sorts of droughts, why is it supposedly also causing record rainfall? (globalclimatescam.com)
Our weather station is very simple to make with toddlers and preschoolers and the weather man spoon works well for recording rainfall. (rainydaymum.co.uk)
Recent record rainfall had turned the field into mud, however, so on the day of our visit, anything «dry» was impossible. (discovermagazine.com)