Okay, I don't know if this is some kind of record... but here in Grimsby... I have literally not even heard a single rumble of thunder this YEAR... not even joking! And I don't just mean the summer months like others are saying... I mean all year! It's actually quite incredible (especially for a place located in Lincolnshire which supposedly is the storm capital of the UK.... although all the storms tend to miss us anyway, they go on in the southern and Wolds parts of the county!) I often think it's something to do with our unusual position on the coast of the Humber Estuary.
Although if this counts, I did randomly wake up one morning this year (I think it was possibly around mid-June), and there was heavy rain outside... so I decided to check on the radar and there had been a few strikes just off the Grimsby Docks (I don't know whether I subconsciously heard them and that's why I woke up). I asked other people if they'd heard anything and yes they said they'd heard two rumbles... however the people I asked live much closer to the Docks than I... I live in south-western Grimsby on the Nunsthorpe estate which is a lot more inland, so for all I know, the rumbles might have not even occurred here... which if so, would make this a completely thunder-less year so far. Really is unbelievable... never known a year like it.