In message , Nick G
writes
What else can I do, I use met office sheathed min & max thermometers housed
in a stephenson screen, also there are electronic thermometers (which agree
with the sheathed thermometers), and the screen is placed away from any
buildings or structures. I was thinking of redesigning the screen to
incorporate a solar-powered fan but this would make the screen non-standard
to the approved design.


Just out of interest, how big is your Stevenson screen?

I once used small screens for micro-climatic studies on the school site,
and found that they over read maximum temperatures.

The problem may well have been the lack of wind in your garden - if it
is so sheltered that you get no wind on a day like Wednesday, then this
may have an effect - in Coventry we had an 18mph gust at 1536hr, for
example and a steady force 3 on a 10m mast in the afternoon. It
certainly felt cool in the shade in Bromsgrove by 1630hr when I visited
my parents' home - my father's thermometer read 10C by then!

Any more Midland readings?
--
Steve Jackson
Bablake Weather Station
Coventry
UK
http://www.netlink.co.uk/users/bws