More than 20mm of rain fell from Friday into Saturday last week - making it the 'wettest July day' in Boyn Hill since 2017, a retired meteorologist in Maidenhead has revealed.
Dr Roger Brugge stated that 27.4mm of rain fell in 24 hours in Boyn Hill, ending at 10am on Saturday, making it the 'wettest July day' there since July 11 2017.
He explained that usually such wet days during July are as a result of thunderstorms, but the rainfalls this year and in 2017 were not due to this.
In 2017, the heavy rainfall was the result of around 13 hours of rainfall.
In July 2007, there was rainfall of 70.2mm on July 19 and this was followed by 28.4mm of rain the following day, all falling in eight-and-a-half hours.
Similar to this month, that rainfall in 2007 was the result of an area of low pressure which provided a long spell of rain, with some thunder.
Early on July 20, 2007, 51 mm of rain fell in Boyn Hill in 63 minutes and 98.6mm fell in the 12 hours ending at 2pm.
Dr Brugge added that the intense rainfall caused some flash flooding and forced the closure of at least six schools in the borough at the time, while ‘about 30 homes were flooded’.
The wettest day locally in the last 125 years is still July 12 1901 when a ‘violent thunderstorm’ led to homes being struck by lightning and property being damaged.
In total 108mm of rain fell at Castle Hill, while at the Lowood rainfall site, 92mm of rain fell in one hour.
This is still the ‘wettest 60 minutes ever recorded in the United Kingdom’, Dr Brugge explained and added that the roads were flooded.
Following on from the rainfall on Saturday, 18.8mm of rain also fell in the 24 hours ending at 10am on Monday.
This means that there has already been 55mm of rain in Boyn Hill so far this July, which is 10 per cent more than expected in the whole month.
The wettest July to date on record is July 1920 when Hall Place recorded 199mm of rainfall.
In 2007, the total rainfall for July in Boyn Hill was 142mm.
Dr Brugge added that July has ‘seen a cool and wet start – but nothing that we have not experienced in the current millennium’.
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