On Mon, 24 Dec 2007 10:02:02 +0000, Mike Tullett
wrote:

On Mon, 24 Dec 2007 09:33:09 -0000, Darren Prescott wrote in


No. For you to record an air frost, it has to be below zero.

It's a shame that digital thermometers don't display the (probably
mathematically incorrect) -0.0C as there's a tiny window of negative numbers
which will round up to 0.0C rather than down to -0.1C. (Technically anything
from -0.00...1 to -0.0499... - okay, not exactly a great range but it still
means once in a blue moon a frost will have been missed due to rounding).

Not only would one need a high resolution sensor/display, but one which is
probably more accurate than is currently possible.

Yes, calibrated instruments would be in trouble for accuracy so such
readings would be pretty meaningless. Not to mention microclimate, I
won't even go there. It's hard enough to get things right to the
nearest tenth, never mind hundredths and in some conditions, the
temperature inside official screens will be a degree or two different
from the true air temperature yet this is known about and is
accepted.

I'm not a fan of decimals never mind hundredths, they make me nervous
(yet the GW debate depends on them).

--
Dave