Update: Provisional Met Office figures for the whole of June are now available at: Met Office confirms wettest June in over a century
Provisional figures from the Met Office to the 27th of June show it has been a disappointing month on all fronts – with many areas being exceptionally wet, very dull and cooler than average.
Currently it is the second wettest June on record for the UK with 130.1 mm of rainfall – just 6 mm off the 2007 total, which was the wettest June in the records which go back to 1910.
It is already the wettest June on record for Wales, with 186.3 mm of rain beating the previous record of 183.1 mm set in 1998. England and Northern Ireland are currently second wettest in the records.
Looking at the figures for the whole of Scotland, it has been a relatively unremarkable month, but there have been big contrasts. North Western areas have seen an exceptionally dry month, while southern and eastern parts have joined the rest of the UK in the wet conditions.
It should be noted that totals for this month so far do not include the heavy rainfall yesterday, and with more rain in the forecast it is likely more records will fall by the end of the month.
It may not be surprising that, with so much rain, sunshine hours have been well down across the UK. There have been 104.2 hours of sunshine so far, just 62% of the long term average (from 1971-2000).
With some sunshine in the forecast, the totals will increase, but it is likely to be one of the duller Junes on record – but it’s not possible to say where it will finish. The current dullest June on record was in 1987, with 115.8 hours of sunshine.
Temperatures have also been below average, with a mean temperature of 11.9 C (0.7 C below average) making for the coolest June since 1991 in the UK.
One of the main reasons for the wet and dull weather so far this month has been the position of the jet stream, which has been much further south than usual. This has meant that rain-bearing Atlantic low pressure systems have been over or close to the UK for the whole month.
|max temp||min temp||mean temp||sunshine duration||rainfall|
|Actual||Diff from 71-00 avg||Actual||Diff from 71-00 avg||Actual||Diff from 71- 00 avg||Actual||% of 71-00 avg||Actual||% of 71-00 avg|
|Eng & Wales||16.5||-1.4||9.5||0.4||12.9||-0.6||100.7||57||139.3||211|
Thanks for another interesting blog. Our June rainfall for North Carmarthenshire in June has today passed 300mm.(A fair bit more than the record breaking Welsh average!). I’m aware that the more Southerly position of the Jet Stream is given as the reason for this poor June (and indeed for many of the record breaking periods of rain/cold/dry weather that the UK has experienced over the last few years).
But my question is, why is the Jetstream behaving in this aberrant way? Try as I might using Google from the hills of Wales, I’ve been unable to unearth an explanation for what is driving this. If there are any theories/models for what is driving these unusual patterns…..and hence whether they’re likely to resolve any time soon, I’d be really interested if you could feature them in a blog,
It is due to a warmer polar region, causing less temperature differential between the north pole and the equator, which in turn means lower pressure, causing the jet stream to slow down significantly. When it slows down, it moves in more whispy patterns and less straight. It also has a tendency to get ‘stuck’ for much much longer, If it gets stuck below the UK, which it now tends to do in the summer months, we experience very poor weather. Instead of being stuck for days, it is now weeks, or months.
Unfortunately I predict that this will continue more and more as climate change progresses.