great! that fixed the conversion problem

nearly there. is there some way to tell whether METRICWX or US is the 
required unit system for the email message? (apart from the obvious, which 
is to make it a weewx.conf parameter).
thanks

On Tuesday, 30 April 2019 21:29:57 UTC+10, Tom Keffer wrote:
>
> Sorry. It should be:
>
> t_vh = weewx.units.ValueHelper(t_vt, 
> converter=weewx.units.StdUnitConverters[weewx.METRICWX])
>
> -tk
>

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