In article ,
Gianna writes:
Stuart Rogers wrote:

I must admit I leave mine at midnight as I have never understood why
met readings should not follow the actual day! But that discussion is
for another thread :-)


It may as well be discussed here.
Could it be that the Met. Office thought it unwise to require its
employees to take the readings from their screen equipment at midnight?
As they would be at work at 0900, perhaps it seemed logical to take the
readings 'first thing'.

I think that's the reason. Not just its own employees, either. It was
even more of a factor when it came to amateur observers.
--
John Hall

"I am not young enough to know everything."
Oscar Wilde (1854-1900)