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Summer 2025 - General Discussion
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You can really see the quickening of the evenings pulling in now. 2 min shorter most days and 3min jumps starting to appear over the next week.
As opposed to the 21 June to 21 July period where you only lose 20min in the evenings in 30 days.
And of course we get the opposite from mid February. The whole cycle of the seasons is amazing really.
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Here I would say very dull. Not terrible, I’ve seen a lot wetter, a lot of the rain in July has been light to moderate with plenty of drizzle. June below was wet here.
Casement had 178.6 hours of sunshine
Knock had 96.2 hours
July
Belmullet had 25 rain days
Roches point 11
Malin and finner broke temperature records during July.
July was dullest in the NW, sunniest in the SE. Johnstown castle had slightly over double the amount of sunshine as knock.
The number of dull days ranged from 1 at both Dublin Airport and casement to 9 at Malin head. Less than 30 minutes of sunshine = dull day. Inland here has less sunshine than Malin so I’d expect it’s more than that.
Based off local climate it’s not been terrible , just dull but that’s common anyway. Pretty average overall.
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The key thing to look out for is humidity (and wind direction*). Humidity is a measure of the amount of water vapour and when that increases, the atmospheric state becomes more favourable for cloud information as the air rises and cools. Dew points are forecast to be in the upper teens on Saturday on the recent GFS run with air temps of 26/27C. This gives minimum relative humidity values of at least 60%+ which when you consider a typical spectacular sunny day gets values below 50%, that's humid. Naturally a hotter airmass is more humid too with a higher ceiling for evaporation and increased water vapour.
Late June 2018 had record-breaking unbroken sunshine for many for days without interruption. Relative humidity values then went below 30% locally. Claremorris had an air temp of 28.7C at 1700 UTC on 29th June 2018 with a dew point of only 9.7C which gives a RH of just 31%. August 2022 was similar, look how identical the synoptics are for 27th June 2018 and 11th August 2022 with the wind direction and high pressure positioning.
High pressure right overhead would help in stabilising an airmass and lowering the humidity as the opposite happens with air sinking rather than rising thus increasing the chances of blue skies.
The charts I posted in the FI thread yesterday were more favourable for unbroken sunshine but if we get more of a plume scenario, expect sunshine to be hazy in nature and risk of sea fog at exposed coasts depending on the exact wind direction.
*Easterly winds favour best for warmth and clear skies. Southeasterlies and southerlies more hazy and humid typically.
Photography site - https://sryanbruenphoto.com/
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