The 6Z GEFS is noticeably colder (for London) in the upcoming cool/cold spell, with the mean now dropping to -6C around the 24th and some runs not far off the -10C line.
The op run is fairly representative of the mean for much of the run, for once, while the control run is on the mild side.
Again, a general dip towards the end of the run, with a few going quite cold (and one proper freeze-up)
Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome