Blimey Graham, that is a tad on the chilly side for your location.

Interesting that your coldest September nights have all been in the last few
years, any ideas on why that would be? My only thought is the possibility
that the last few Septembers have been more settled than the previous ones.


Nick,

Yes, I was really surprised when I saw the minimum, but the wind did
go completely calm for a while, and it was very clear. The majority of
Octobers (10 out of the last 15) don't see temperatures that low.
It's risen very rapidly now, as much do to the breeze setting in as
the sun, up to 12C by 10:10BST.

The only really comparable September min was 24/2003 (14.8) and it was
another quiet late September speIl.

In 1995 there was a northerly wind on 18th-20th, but the mins were
13/14/10.5 respectively, and the max each day close to 20C. The air
clearly didn't originate far to the north.

Graham
Penzance