The Euro monsoon is an early summer thing, what you're mentioning is the gradual transition towards autumn as the jet slowly sinks south again. I remember much discussion about this in the 90s over on usw, and after digging it's one Hubert Lamb we have to thank for it, a chap who was much spoken about in the early days of Net access but who's barely mentioned now.
https://www.bbc.co.uk/webarchive/https%3A%2F%2Fwww.bbc.co.uk%2Fblogs%2Fpaulhudson%2Fentries%2F2034a3cf-e517-3432-a412-21b5dc53cfe2
Another part of his work was to analyse weather patterns over 100 years to try and see if any repeat themselves across the UK, with some success.
One of his main findings was a change of pattern from around the middle of June, which, in his words, saw the ‘return of the westerlies’.
By looking at climate data he discovered, more often than not, the Atlantic would re-assert itself around or just after mid-June, bringing changeable weather once more across our shores.
This would follow a period when westerly winds were at their weakest.
I've always thought of it as an early rather than mid-June thing - perhaps I've misremembered, perhaps I'm going by my own experiences, perhaps due to global warming it's moved a couple of weeks earleir. Who knows, but what I do know is it's one of the more reliable things to look for in terms of "at this time of year, it does x".
As for those cracks, trust me - you don't want them. Not only does it cause cracks in the lawn, but it leads to subsidence if you're unlucky - as it causes foundations and the buildings above to shift. I know Ireland has a reputation for being soggy (there's undoubtedly marketing at work in the "emerald isle" moniker, but there's a grain of truth to it as well). I think if you ever came on a holiday to Kent, Essex, Sussex, London - you'd be surprised at how arid it is these days most summers! It really is a world away, and of late the contrasts seem to have been getting greater... to the point where even the wolf centre at Reading, 100 miles away, is invariably greener and lusher, with more rain, than is the case here. 20 years ago it was much of a muchness, perhaps a bit drier here but not massively so.
Originally Posted by: Retron