This is a good reflection of just how poor the extended summer of 2021 has been as of this point at Heathrow (and or southern England) with only 74 20C days this year so far (lowest in the series), 18 25C days (joint lowest with 2011) and 4 30C days. pic.twitter.com/lEs465MtaV

— Sryan (@SnowbieWx) August 20, 2021