Tom, the standard skin seems to have an aggregate_type = none in the image section header which covers the day plot and aggregate_type = avg for the week images header - which clearly wont work for the winddir for reasons you gave. I am baffled in that the original plot appeared to be a day plot, so should have had no aggregate.
Miguel - try and set aggregate_type = none for the daily winddir plot and see if it makes a difference. On Monday, 19 September 2016 22:00:49 UTC+3, Miguel Iniesta wrote: > Hello Tom, > > This plot has not been customized. It is the original wind dir plot from > skin.conf. > > [[[daywinddir]]] > # Hardwire in the y-axis scale for wind direction > yscale = 0.0, 360.0, 45.0 > [[[[windDir]]]] > > Therefore, the problem is that the value of $current.windDir corresponds > to the arithmetic average of all the compass wind direction over each > archive interval, while we expect the vector averaged wind speed. Is it > correct? > In that case, it would be very useful to change it. > Please, let me know if I can help. > > > Thank you very much. > > On Sunday, September 18, 2016 at 8:35:03 PM UTC+2, Tom Keffer wrote: >> >> Hello, Miguel >> >> Are you using an aggregation type of 'average' for your plot? If so, the >> average of, say, 355 and 005 will be 180, not 0 as one might expect. >> >> -tk >> >> >> On Sun, Sep 18, 2016 at 9:45 AM, Miguel Iniesta <mgn...@gmail.com> wrote: >> >>> >>> Hello, >>> >>> WMR 300 >>> weewx v3.5.0 driver 0.10 >>> >>> There seems to be an error with wind direction in range about 330 - 30. >>> Yesterday 17/9/2016 about 18 h., I observed that while wind direction >>> (station display and sensor) was N weewx recorded S. >>> Afterwards, when wind direction changed to NW (under 330), weewx wind >>> direction record became correct. >>> >>> Unfortunately At this time of year, I can monitor the station just for >>> some hours a week. >>> >>> Regards, >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "weewx-user" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to weewx-user+...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.