"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