Col in my published extreme rainfall study I noted that most
of the severest rainstorms of the past 100 years occurred in
summer.

Lynmouth flood disaster - August 1952
Martinstown record rainfall - July 1955
Torquay flooding - August 1948
Hampstead storm - August 1975
Wokingham storm - August 1959
I could go on ......

or back:

The Great Moray Floods - August 1829

Anne