On 30/10/2017 19:20, Norman Lynagh wrote:
Ken Cook wrote:

On Monday, 30 October 2017 18:51:58 UTC, Desperate Dan wrote:
When mig thermometers were used the regulation height was 2.5cm to 5cm
above ground with the thermometer bulb “just touching the tips of the
grass”. (Are mig thermometers still used?)

mig have been taken out of use at all MetO sites for H&S reasons, however
grass min thermometers are alcohol in glass and are still used at manual MetO
sites such as Copley. We have artificial and natural grass here. The
artificial normally reads higher. Ken Copley
Teesdale

We have natural green grass!

The problem with natural grass (green or otherwise) is it has a tendency
to grow. And if allowed to grow too much at an unmanned station (or even
a manned one) then the temps won't be any more representative than
artificial grass (which at least doesn't grow). Of course, if the
station's manned there's always someone to cut it. Isn't there?