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Almost never - despite the very dullness of our summers it is almost unheard of to have a day with 0 sunshine. In fact, to the point where it is statistically meaningless and irrelevant.
This is despite the fact that June is overwhelmingly the sunniest month of the summer, and August by far the dullest. So, a pointless statistic. Best stick to sunshine hours.
If we're talking completely overcast summer days, I wonder if anywhere (and I mean anywhere at all, never mind a decent-sized city!) can beat Edinburgh's run in early July 2012? To put it into some sort of context, Edinburgh has about 17.5 hours of daylight at that time of year, so this spell as a whole was roughly 99% overcast.
If we're talking completely overcast summer days, I wonder if anywhere (and I mean anywhere at all, never mind a decent-sized city!) can beat Edinburgh's run in early July 2012? To put it into some sort of context, Edinburgh has about 17.5 hours of daylight at that time of year, so this spell as a whole was roughly 99% overcast.
PS - look at that diurnal range on the 7th!
Oh yuck! Can you imagine how god awful a July day would be that didn't budge from 56F and was cloudy all day. Scotland has an awful climate.
Oh yuck! Can you imagine how god awful a July day would be that didn't budge from 56F and was cloudy all day. Scotland has an awful climate.
I'd be curious to know what was the coldest summer weather ever recorded for various Scottish towns/cities. I'd imagine more or less everywhere in Scotland has had June days not break 10C (as happened in a lot of northern English sites on 3 June 2012), but I wouldn't be so sure for July and August.
If we're talking completely overcast summer days, I wonder if anywhere (and I mean anywhere at all, never mind a decent-sized city!) can beat Edinburgh's run in early July 2012? To put it into some sort of context, Edinburgh has about 17.5 hours of daylight at that time of year, so this spell as a whole was roughly 99% overcast.
Sam. 7 13.1 °c 11.8 °c 24.4 mm 0 h Dim. 8 15.4 °c 11 °c 0 mm 0.1 h Lun. 9 13.7 °c 10.6 °c 0.6 mm 0 h Mar. 10 12.1 °c 9.9 °c 7.4 mm 0 h Mer. 11 13.5 °c 9.4 °c 1.8 mm 0.1 h Jeu. 12 13.2 °c 9.1 °c 1.2 mm 0.1 h Ven. 13 12.8 °c 8.8 °c 1.6 mm 0 h
If July were a 30-day month, Aberdeen would not even have broken 60 hours in 2012 - bad beyond belief, even compared to their June 2012 with only 80.8 hours. Still, the month 'only' had eight sunless days. (One climate oddity, particularly considering how far north Aberdeen is, is that June and July 2012 both failed to beat January 2012's 83.3 hours, and March 2012's 163.9 hours beat both that year's midsummer months put together.)
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