> For UK conditions, a temperature measuring method that
> incorporated averaging or integration over the full 24 hour
> period, would be needed as the weather can change dramatically
> many times during a day.

That's not what the extensive experience of greenhouse growers
as a group shows.  Plants grow in a cumlative stepwise manner,
so if the average temperature for the day (the sum of the daily
high and low, divided by 2) is greater than 55 degrees, you have
so many "growing degree days, and the plant has made progress
towards bud, bloom, and maturity.  This is not guess-work, this
is bonda-fide Science with a capital "S", and one can even find
the number of GDDs on many seed packages.

        jim (The Ten Commandments - now available
             in convenient tablet form!)

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