ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. The figure was
translated as 107°F. Well, no harm in adding one for luck, I always
say.
I left a couple of thermometers out in the sun to obtain a sort
of "grass max" and they were both less than 2°C higher than the screen
temp of just over 21°C so how they got 41° is a bit beyond me. Maybe
they had only just taken it out of the oven. Or something.

Tudor Hughes, Warlingham, Surrey.

On Sat, 30 May 2009 09:23:58 -0700 (PDT), Tudor Hughes
wrote:

ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. The figure was
translated as 107°F. Well, no harm in adding one for luck, I always
say.
I left a couple of thermometers out in the sun to obtain a sort
of "grass max" and they were both less than 2°C higher than the screen
temp of just over 21°C so how they got 41° is a bit beyond me. Maybe
they had only just taken it out of the oven. Or something.

Tudor Hughes, Warlingham, Surrey.


I put the indoor unit of my Oregon sensor outside in the sun and
recorded 43C at 5.15 pm. Shade temperature 25C.

Paul
Troon

Tudor Hughes wrote:
ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. The figure was
translated as 107°F. Well, no harm in adding one for luck, I always
say.
I left a couple of thermometers out in the sun to obtain a sort
of "grass max" and they were both less than 2°C higher than the screen
temp of just over 21°C so how they got 41° is a bit beyond me. Maybe
they had only just taken it out of the oven. Or something.

Tudor Hughes, Warlingham, Surrey.

My grass thermometer showed a maximum today of 41.2°C at 15:55, though it
had been around 40°C since 13:00. Starting to drop off slowly now but still
36°C at 17:45.

With a grass minimum of 6.5°C that's a big range in just a few hours.

Yesterday the grass max peaked at 39.9°C.
________________
Nick.
Otter Valley, Devon
83 m amsl
http://www.ottervalley.co.uk

ITV showed a digital thermometer sitting out in the sun and reading 41°C, just to show how hot it really was.

My 18 year-old son, who is certainly not a science nerd, came and told
me (he had seen it on another TV) using the words: "what a load of b-
ll-cks".

Sure, the grass might have been that hot, but showing a thermometer in
full sun and trying to give some credence to its reading is precisely
what my son meant.

Nearby Northolt and Heathrow were giving (shade) temperatures 22 or 23
so I suppose in the cauldron of Wembley, it might have been 26C

Jack

wrote in message
...
ITV showed a digital thermometer sitting out in the sun and reading 41°C,
just to show how hot it really was.

My 18 year-old son, who is certainly not a science nerd, came and told
me (he had seen it on another TV) using the words: "what a load of b-
ll-cks".

Sure, the grass might have been that hot, but showing a thermometer in
full sun and trying to give some credence to its reading is precisely
what my son meant.

Nearby Northolt and Heathrow were giving (shade) temperatures 22 or 23
so I suppose in the cauldron of Wembley, it might have been 26C

Jack

But of course the grass, players and spectators do not sit in little white
boxes, unlike instruments recording the "official" temperature. Only those
under the shade of the stands probably experience something close to that -
the others (just like anybody else out in the sunshine) feel the 40C or so
figure. Moreover the inside of Wenbley does not have the benefit of the
pleasant breeze enjoyed elsewhere.

In my opinion therefore not b...ks but an indication of how hot it "feels"
like.

Roger

"Tudor Hughes" wrote in message
...
ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. The figure was
translated as 107°F. Well, no harm in adding one for luck, I always
say.
I left a couple of thermometers out in the sun to obtain a sort
of "grass max" and they were both less than 2°C higher than the screen
temp of just over 21°C so how they got 41° is a bit beyond me. Maybe
they had only just taken it out of the oven. Or something.

Tudor Hughes, Warlingham, Surrey.

=============================================

I am often asked a question like "if it is 80 in the shade, then what must
the temperature been in the sun?"

My answer is along the lines of "depends what you are using to measure it,
material wise. A mercury thermometer will very likely register a higher tem
than an alcohol one. A digital thermo in a black case will register higher
than one in a white case.

I never pay any attention to statements such as "it was 110f in the sun on
Centre Court at Wimbledon", as it is impossible to accurately measure such a
figure.

Jim.
Bournemouth

Jim Smith wrote:

I am often asked a question like "if it is 80 in the shade, then what must
the temperature been in the sun?"

My answer is along the lines of "depends what you are using to measure it,
material wise. A mercury thermometer will very likely register a higher
tem
than an alcohol one. A digital thermo in a black case will register higher
than one in a white case.


Another answer would be to say that it's not 27 in the shade. The reported
temperature of 27 is that of the air in the sunshine. The shade temperature,
if anyone bothered to measure it, would be lower than that registered by a
properly exposed thermometer.

--
Graham P Davis, Bracknell, Berks., UK. E-mail: newsman not newsboy
"I wear the cheese. It does not wear me."

On 30 May, 18:31, "Roger Smith" wrote:
wrote in message

...

ITV showed a digital thermometer sitting out in the sun and reading 41°C,
just to show how hot it really was.

My 18 year-old son, who is certainly not a science nerd, came and told
me (he had seen it on another TV) using the words: "what a load of b-
ll-cks".

Sure, the grass might have been that hot, but showing a thermometer in
full sun and trying to give some credence to its reading is precisely
what my son meant.

Nearby Northolt and Heathrow were giving (shade) temperatures 22 or 23
so I suppose in the cauldron of Wembley, it might have been 26C

Jack

But of course the grass, players and spectators do not sit in little white
boxes, unlike instruments recording the "official" temperature. *Only those
under the shade of the stands probably experience something close to that -
the others (just like anybody else out in the sunshine) feel the 40C or so
figure. *Moreover the inside of Wenbley does not have the benefit of the
pleasant breeze enjoyed elsewhere.

In my opinion therefore not b...ks but an indication of how hot it "feels"
like.

Roger

I do like you're argument Roger, and personally agree with it !

As others have said, how do you measure the temperature in the direct
sun ?!
There are as have already been pointed out all sorts of things that
will interfere with the reading - probe/background/mounting colour
being I would have though the biggest one... What I wonder is, would
a metalic silvered probe be best ?

I fear this to be a very long winded unanswerable discussion...?!

On May 30, 9:59*pm, "Jim Smith" wrote:
"Tudor Hughes" wrote in message

...
* * * *ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. *The figure was
translated as 107°F. * Well, no harm in adding one for luck, I always
say.
* * * *I left a couple of thermometers out in the sun to obtain a sort
of "grass max" and they were both less than 2°C higher than the screen
temp of just over 21°C so how they got 41° is a bit beyond me. * Maybe
they had only just taken it out of the oven. *Or something.

Tudor Hughes, Warlingham, Surrey.

=============================================

I am often asked a question like "if it is 80 in the shade, then what must
the temperature been in the sun?"

My answer is along the lines of "depends what you are using to measure it,
material wise. A mercury thermometer will very likely register a higher tem
than an alcohol one. A digital thermo in a black case will register higher
than one in a *white case.

I never pay any attention to statements such as "it was 110f in the sun on
Centre Court at Wimbledon", as it is impossible to accurately measure such a
figure.

Jim.
Bournemouth

The thermometers I exposed were mercury-in-glass and alcohol-
in-glass where the plastic backing stops about an inch and a half from
the bulb. My guess is that the small difference between screen and
sun temperature was due respectively to the sunlight being reflected
from the mercury and passing through the alcohol, in neither case
being seriously absorbed. Both recorded roughly the same slight
excess.
The temperature it "feels" like will depend on skin colour
for one thing, with Africans ironically getting hotter than Europeans
though obviously suffering negligible sunburn. Another factor is
whether or not the skin is covered in sweat because if so one should
use the wet-bulb temperature which today was quite low. Don't forget
windchill, of which there would have been at least a little.
All one can say, really, is that the temperature inside a
dry, probably poorly-ventilated black plastic box in the sun was 41°C,
or, more usefully, about 17 degC above air temperature.

Tudor Hughes, Warlingham, Surrey.

On 30 May, 17:23, Tudor Hughes wrote:
* * * *ITV showed a digital thermometer sitting out in the sun and
reading 41°C, just to show how hot it really was. *The figure was
translated as 107°F. * Well, no harm in adding one for luck, I always
say.

Tudor - pedants corner alert - I thought said thermometer read 41.7C -
in which case pretty much bang on 107F "in old money" as is the wont
when you talk about fahrenheit these days. Cup Final Saturday wouldn't
be the same without the pitch-side thermometer when it's sunny. Shame
about the result...

Richard