Hello -

I've just started measuring air temperature in my back garden and posting
the results to a website at http://www.sgurr.co.uk/nailsea/index.html

I'm curious about the shape of the graphs I'm getting, and whether I can use
the "spikyness" of them to tell me whether I'm shielding the temperature
sensor from the sun and the night sky well enough.

I fitted a larger sun shield about 2 weeks ago, and I'd appreciate any
comments on whether the previous-week graph now looks plausible, or whether
the spike on 18th April (for example) indicates the need for a better
shield.

Thanks

In uk.sci.weather on Sat, 21 Apr 2007, Simon
wrote :
Hello -

I've just started measuring air temperature in my back garden and posting
the results to a website at http://www.sgurr.co.uk/nailsea/index.html

I'm curious about the shape of the graphs I'm getting, and whether I can use
the "spikyness" of them to tell me whether I'm shielding the temperature
sensor from the sun and the night sky well enough.

Looks fairly normal to me for the kind of weather we've been having.
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

"Simon" wrote in message
...
Hello -

I've just started measuring air temperature in my back garden and posting
the results to a website at http://www.sgurr.co.uk/nailsea/index.html

I'm curious about the shape of the graphs I'm getting, and whether I can
use
the "spikyness" of them to tell me whether I'm shielding the temperature
sensor from the sun and the night sky well enough.

I fitted a larger sun shield about 2 weeks ago, and I'd appreciate any
comments on whether the previous-week graph now looks plausible, or
whether
the spike on 18th April (for example) indicates the need for a better
shield.

Thanks



You can see the one minute data and graphs for Wokingham AWS at:
www.woksat.info/wwp.html
Click on page 6

This data is from an aspirated temperature/RH probe. Temperature values in
the standard Stevenson screen are generally within 0.2C of this, but are
dependant on the airflow through the screen. Beware, though, if you are
using a non-standard radiation screen, your readings may not be comparable
with others where the standard or a different type of screen from yours has
been used.
And, the minute by minute variation will depend on the time constant of your
probe, and whether you are taking a spot value each minute, or an average of
many samples in the minute.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.woksat.info/wwp.html
or
www.btinternet.com/~wokingham.weather/wwp.html