Thanks for that info Gary - I had not noticed the [[DegreeeDays]] section 
of weewx.conf before.  I am sure that setting the appropriate base 
temperature would provide the necessary information for fighting his worms 
- and as the base is set in a skin could result in a customised "Worm 
destruction" report which is based on the NOAA reports!!  I modified the 
base template to provide an HTML prettier NOAA report, so combining the two 
could generate a pretty Worm report without needing to go to the trouble of 
storing data just to generate graphs.

On Sunday, 24 September 2017 10:17:22 UTC+3, gjr80 wrote:
>
> Heating and cooling degree base temps are set in the respective skin.conf 
> under [Units] [[DegreeDays]] using options heating_base and cooling_base 
> (have a look in the Standard skin.conf). If omitted the default of 65F is 
> used.
>
> As for plotting the data, the number 1 rule for the weeWX plot engine is 
> "it can only be plotted if it's stored in the archive". Heating and cooling 
> degree days are not in the default weeWX schema nor are they calculated for 
> each archive/loop period. Rather they are calculated as an aggregate over 
> some period, eg $month.heatdeg.sum, for use in a cheetah generated report. 
> I am sure heating and cooling degree days could be archived so that weeWX 
> can plot them but there will be a bit of coding involved.
>
> I know little of the life cycle of the cydia pomonella, but I suspect the 
> NOAA format monthly report (with an adjusted base temp if required) may be 
> the simplest approach to get the info you are after. A customised report 
> could be produced that generates a running total, the report for the 
> current month is updated each report cycle so it would be very close to 
> being current (within an archive period) if that matters. If a more funky 
> weeWX generated plot is required then I suspect there will be some 
> significant work required.
>
> Gary
>
>

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