Dry conditions are well-known to be the time when sites are photographed in greater detail and found easier.
In Britain 60 new sites have been found in Holderness in just one day! And it is said that since the drought of 1976 some sites have not been visible.
English Heritage senior investigator Dave MacLeod said: "It's hard to remember a better year.
"Cropmarks are always at their best in dry weather, but the last few summers have been a disappointment.
"This year we have taken full advantage of the conditions. We try to concentrate on areas that in an average year don't produce much archaeology."
A Roman camp near Bradford Abbas, Dorset, was revealed in June after three sides became visible in rain-parched fields of barley. The lightly built defensive enclosure would have provided basic protection for Roman soldiers while on manoeuvres in the first century AD and is one of only four discovered in the south west of England.