May 2020 had a brief northerly, where it was still sunnier than every spell of weather we've had so far this year until possibly the current one. Other than that the month was pretty much perfect and as you say there's no comparison. No need to bring other years down to try to dress up this disgrace of a year.
A bit of cloud this afternoon but still almost all sunshine. We've leaped into summer in one day here with indoor temperature jumping to 20C. Finally no long sleeves.
Copy of yesterday really, just a bit more cloud about. 15C. The sad thing is in late May and 2C below average this is still one of this Spring's better days.
Maybe your spot got extremely lucky dodging the showers. Met office description does say loads of thundery showers in late May and some in early June too.
https://www.metoffice.gov.uk/binaries/content/assets/metofficegovuk/pdf/weather/learn-about/uk-past-events/summaries/uk_monthly_climate_summary_201805.pdf
https://www.metoffice.gov.uk/binaries/content/assets/metofficegovuk/pdf/weather/learn-about/uk-past-events/summaries/uk_monthly_climate_summary_201806.pdf
Late May/early June had loads of thunderstorms with a similar pattern of high pressure to the North and shallow Iberian lows regularly bumping into the South
Looks like 15C will be the peak. So for all the hype yet again we finish below average. Cloud will roll in keeping temperatures mild overnight then we'll be gaslit into believing this is an above average month. Repeat for the whole Spring.
Even with the sun this afternoon, thanks to a terrible day yesterday and this morning the house is freezing, only 16.4C indoors. Getting fed up of this now, should not have to think about putting the heating on in Mid May.