It seems like a good time to join in with this comparison now that the August and summer totals are in. Here are my figures for Molesey, north Surrey. This is a drier area than most of London due to low altitude near The Thames.

Last 3 months 43%

Last 6 months 93% (spring was 155% here)

Calendar year to date 95% of the average to this date

Last 12 months (i.e the hydrological year) 84% 529mm (last autumn was very dry). LTA 627mm based on the last 18 years here (but the 30 year averages should be around 605mm- the early 2000s were wet in these parts).

To put it another way, here are the %s for the last 4 seasons.

Aut '17 56%
Win 17-18 99%
Spr '18 155%
Sum '18 43% - with a grand total of 0.1 in June.

The rainfall deficit here has maybe been less intense this year than elsewhere due to the wet spring but each of the last three years has been below average (and below 600mm).

Julian Mayes, Molesey