1. 2018. I dont think there is too much disagreement this is the best when taking the overall summer into account. Even the 2nd half of August had some decent days.. yes there was autumnal rubbish as well but not bad.
2. 2013. For the brilliant july. This was on a par with, and in fact more thundery than july 2018 especially in the last third. The only reason the 2013 july CET was a shade lower than 2018 was the first few days were very cool. July 2018 had NO cool days. As an individual month the best of the decade. August decent enough, june a bit meh, but not much rain.. just cool and cloudy at times.
3. 2014. June and July combined were excellent and had their fair share of thunder as well (I do like a good summer storm!). There was a classic plume, followed by a whole week of high 20s in july which stood out. June not overly hot but consistently pleasant, and surprisingly thundery for a non-humid month. August was a shocker though, with no heat at all and notably cool weather in the 2nd half. If the august was better this could have been higher, perhaps?
4. 2019. This was mixed, with an awful first half of june but it turned much better, july decent and of course holds the UK's all time high, and this alone makes it stand out to at least some degree. August mixed but warm, and a brilliant bank holiday weekend.
5. 2016. I was abroad for the very thundery period at the start of june so couldn't comment, but the rest of the month was warm but wet from memory. July meh, albeit a brief but intense heatwave 19th and 20th. August actually very good with numerous warm and a few hot day
6. 2017. Good heatwave in june, went downhill in july after spectacular plume storms mid month. August poor, luckily was away for some of it! Bank holiday being nice was the only good point of the month
7. 2015. Apart from the july temperature record (at the time!) nothing stands out about this summer. There were a few storms yes but nothing severe here, august had a few nice days but was generally wet
