Months:
July 2007 - Very wet and dull throughout, with the 20th being a particularly wet day.
August 2008 - Wet, dull and cool throughout.
December 2015 - Mild and wet.
April 2012 - The worst spring month of my lifetime.
June 2012 - Horrific throughout. I remember it feeling particularly autumnal on the Queen's Diamond Jubilee with a temp of only 12 Celsius.
June 2016 - Warm and sunny for the first week, but the heavens opened for the rest of the month.
July 2012 - Warm and sunny later on, but a horrific summer month overall.
November 2021 - Unseasonably mild and boring.
Seasons as a whole:
Autumn 2000 - Very wet throughout.
Summer 2007 - The first in a series of poor summers.
Summer 2008 - June wasn't too bad I guess, but July and August were very poor.
Summer 2012 - August was the best of the summer months during that notoriously horrific summer.
Winter 2016/17 - Anticyclonic gloomfest.
Winter 2019/20 - Constantly wet and mild.
Spring 2023 - Didn't really get going until May.