On 31 Mar, 15:46, "ronaldbutton" wrote:
A questions for the experts...would it not be better to construct Stevenson
screens from polishes aluminium or any reflective metal rather than a white
painted surface ,which in my experience absorb some heat especially when
they get dirty in urban situations...?.

RonB

I had an AWS screen made from white-painted polished aluminimum for
several months. It was terrible. It read far too high in light winds
and strong sunshine - up to 4 degC above Stevenson screen and adjacent
(plastic) AWS radiation shelter, while at night it cooled more quickly
and behaved more like a grass min sensor. I eventually returned it to
the suppliers and requested a full refund as it was unfit for purpose
i.e. meteorological monitoring. After a lot of arguing, I did
eventually get the refund. No, having tried it, I wouldn't recommend
using painted aluminimum, Ron!

--
Stephen Burt
Stratfield Mortimer, Berkshire