If you are referring to this text:
"The max average wind speed. The wind is averaged over each of the archive
intervals. Then these numbers are averaged. Note that this is *not* the
same as the maximum observed wind speed."

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in the table under wind <http://weewx.com/docs/customizing.htm#Wind> in the
Customization Guide, then yes you are correct, it is not the average of an
average it is the max of the average. The error is in the description not
in the calculation.
Clearly from your wind graph windSpeed and windGust are different.So until
we see the template I suspect the issue will remain.
Gary
On Friday, 13 January 2017 19:49:35 UTC+10, dwhi...@googlemail.com wrote:
>
> I wouldn't expect the lines to be the same as that is not the problem. The
> gust figure will normally be higher than the average.
>
> The problem lies with $day.windSpeed.max - this is a single figure so not
> plotted on the graph. The docs say that this is calculated by averaging the
> windspeed over the interval and then averaging all the intervals. This is
> wrong. It should be averaging over the interval and then selecting the
> highest figure (hence max).
>
> I don't know whether the error is in the documentation or in the coding
> but the value produced is wrong. It appears that the value produced is
> always the same as the maximum gust speed ($day.windGust.max)
>
>
>
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