The highest standard 0900 GMT - 0900 GMT rain day record however remains 279 mm at Martinstown , Dorset set on 18 July 1955 , as much of the historical data is recorded in this way .
The highest standard 0900 GMT - 0900 GMT rain day record however remains 279 mm at Martinstown , Dorset set on 18 July 1955 . 
 Much of the historical data is recorded in this way .