Re: [weewx-user] Davis Vue Wind Direction Issue

[Tom Keffer]

If you did not change anything except the ISS, I don't have an explanation. 

The Standard skin uses a continuous line to display wind direction, which is not a very good choice. Much better is to use discrete marks, which is what the Seasons skin does. That will make the display look much better.

Go into the file /etc/weewx/skins/Standard/skin.conf and change this

[[[daywinddir]]]
    # Hardwire in the y-axis scale for wind direction
    yscale = 0.0, 360.0, 45.0
    [[[[windDir]]]]

to this

[[[daywinddir]]]
    # Hardwire in the y-axis scale for wind direction
    yscale = 0.0, 360.0, 45.0
    line_type = None
    marker_type = box
    marker_size = 2
    [[[[windDir]]]]

Do the same thing for sections [[[weekwinddir]]], [[[monthwinddir]]], and [[[yearwinddir]]] in the same file.

That should help a lot.

On Fri, Oct 10, 2025 at 12:20 PM 'dens...@yahoo.com' via weewx-user <weewx...@googlegroups.com> wrote:

I replaced my Davis Vantage Pro 2 Exterior Sensor Suite with a Vantage Vue Sensor Suite due to hardware failures. Since then my Weewx Day Wind Direction graph (daywind.png) has been unreadable due to constantly jumping up and down full scale (see image)

The Vue Sensor suite is aimed in the correct direction (solar panel to the south).

Attached is my config file, that did not change, and  the syslog.

I hope there is a simple solution that you can help me with...

Everything else seems to be functioning as expected.

Thanks for considering this issue..

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[dens...@yahoo.com]

Tom,

Thank you. That change made a big difference. Except for a Weewx update nothing changed except the outdoor sensor unit. I have not touched the Standard Skin that I remember. Perhaps when I first created my weather station but that was too long ago (8 years) to remember. 

Glad you were there to help... appreciated,

Den

... I am going to monitor other near by stations and see if we agree on wind direction.

[michael.k...@gmx.at]

It would be interesting what the above plot would have looked like with using discrete marks.

[dens...@yahoo.com]

Here are Tom's recommended changes to the Day and Week graphs......

[michael.k...@gmx.at]

the data points seem to be tied to the resolution of the vane's sensor, with your archive_interval of 300, I'd expect the day graph more like the week graph, there should be more than a single value (from the LOOP packets) averaged for the wind direction, giving it a smoother look.

[dens...@yahoo.com]

Davis claims the windspeed and direction updates approximately every 2.5 seconds.  The Davis Pro 2 console to computer is via USB.

Suggestion on how to improve the look? I'm open to suggestions.

I am running almost what was downloaded via Weewx way back when. My web page is custom but I have not done much of anything to the Davis / Weewx data collection.

Den

[dens...@yahoo.com]

PS... I am running via a SSD so storage space is not an issue.

[Tom Keffer]

By default, Davis stations use hardware record generation. Also, the default for day plots is not to do any averaging, so the net result is that you're looking at every archive record as it comes off the console. The Davis archive records offer only 22.5° resolution, hence the quantized look.

For the week plot, you're looking at the vector average over (by default) one hour, so values other than 22.5° increments are possible.

If you really don't like the look of the day plot, you could switch to software record generation. Then you would see the vector average over the archive interval, rather than the discrete values that the console is emitting. 

-tk

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