So we've got unusual weather this year: snow and frost in late March, in London.
I say 'unusual' because it's not abnormal or even all that uncommon: we've had a run of mild winters and warm springs, but the last century's weather records place this week's unseasonal chilliness in the 1-in-20-years category. It's not even a once-in-a-lifetime event.
Now take a look at a climate chart for somewhere with a nice, mild, 'marine' climate, just like London and a little further south. Looking at that chart, March has sunny days and some of them are almost warm; but most days hover around freezing and some are several degrees below it. You'll get a frost in June, at least once, most years.
Looking charts for places on the latitude of London* makes me very glad the North Atlantic Drift and its associated 'Gulf Stream' climate are, for now, stable and predictable. I hope that this remains the case throughout my lifetime.
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*Voronezh, Saratov, Reykjavik, Regina, and Gander.
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