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It's not only the number of thunderstorms you get, it's the intensity that matters. A couple of cracks of thunder and a shot of intra-cloud lightning barely qualify as a thunderstorm.. In my view anyways.
Looking at that map, European thunderstorms look rather weak.
15 days of thunder, isn't 15 actual thunderstorms. I don't see the point of thunder days. Why not just record actual thunderstorms?
I don't make that decision, you should ask the Met Office. I'm guessing it's easier to measure thunder than it is to decide what constitutes a thunderstorm? Do you have to see the lightning, within 1, 2, 3km? Does the central core have to pass directly over the weather station?
We rarely hear thunder here without a storm being within 2-3km at the most. I'd say 10-12 of the 15 days are thunderstorms either overhead or within 3km.
About twenty thunderstorms a year here, mostly in late summer and early autumn.
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