In article ,
Peter Clarke writes:
he first book about the weather that I had was by the Bartlett brothers -
this must have been about 1948. I think it was called " Signpost to the
Weather" . Sadly, I think I binned it many years ago. The most interesting
feature of it was a broad brush forecast for each month , broken down into
4 week periods( which Keith mentioned)- most of which I have forgotten. The
only bits I remember were that cold spells were forecast for the middle of
both January and February with unsettled weather for the first and fourth
weeks. I think the cold winters of the early 1940s probably influenced them.
I enjoyed reading Keith's item about them, most of which I didn't know.
They also wrote for the' London Evening Standard'

It sounds like they might have been influenced by the work on
singularities, adapted for the UK from the German original by CEP
Brooks. I seem to recall the singularities for January and February
indicating the likelihood of spells as described above.
--
John Hall
"Men occasionally stumble over the truth, but most of them pick
themselves up and hurry off as if nothing ever happened."
Winston Churchill (1874-1965)