Display Rainfall

[Ryan M.]

Hello,

Is it possible for weewx to display rainfall like the attached graphic portrays?

Regards,

Ryan

[gjr80]

Hi,

It’s not clear to me what that plot shows, it says cumulative; is it rainfall in the last hour? It’s not rainfall this day.

Since v3.9.0 WeeWX has been able to plot cumulative data; however, as far as I know the accumulation only starts at the earliest time of the plot and continues over the entire plot. So for a Standard WeeWX ‘day’ plot the accumulation starts 27 odd hours before the current time and the data is accumulated over the entire 27 hours. Not quite what you want.

Thinking outside the box you could create a similar plot by creating a custom field in your archive and saving your cumulated data in that field. You could then use the WeeWX plot capabilities in the normal (non-cumulative) manner to plot that custom field.

Gary

[rich T]

How was that plot generated? I see it is a 24 Hr time period, but was it plotted every 5 minutes. Here is a sample plot based off of a 5 minute archive period.

[Ryan McCammon]

I think your workaround makes sense. Thanks for the feedback.

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[Ryan McCammon]

Gary's workaround is what I'm aiming for.

On Mon, Jun 24, 2019 at 8:44 PM rich T <storm...@gmail.com> wrote:
>
>
>
>> How was that plot generated? I see it is a 24 Hr time period, but was it plotted every 5 minutes. Here is a sample plot based off of a 5 minute archive period.
>

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[gjr80]

Just bear in mind that whilst the creation of a custom database field (or re-purposing of an existing one) is straightforward and well documented you will need to develop some custom code to populate the field. Easy enough to do but this is not a turnkey solution.

Gary

On Wednesday, 26 June 2019 06:33:00 UTC+10, Ryan M. wrote:

Gary's workaround is what I'm aiming for.



On Mon, Jun 24, 2019 at 8:44 PM rich T <storm...@gmail.com> wrote:
>
>
>
>> How was that plot generated? I see it is a 24 Hr time period, but was it plotted every 5 minutes. Here is a sample plot based off of a 5 minute archive period.
>
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[Thomas Keffer]

Many weather stations provide dayRain.

It also seems like something StdWXCalculate should provide.

-tk

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[Ryan McCammon]

Hi Thomas,

Thanks for your feedback. I've got a Pro Vantage 2, and am running
weewx v. 3.7.1.
It seems that there should be a way to sum rainfall over a period of
time (3 hours?),
and display it like the graphic I provided. A cumulative rolling total.

That said, thank you for your efforts in the programming/support for weewx.

Regards,
Ryan

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[Pat]

The chart rich shows is from my skin called Belchertown which takes rain over a timespan to create the "rainTotal" observation for that timespan. "rainTotal" is just a simple addition of the "rain" observation across the timespan. As far as I know this type of aggregation isn't available within weewx, which is why I did it like this. So you could make a "rain over last 3 hours" chart if you wanted using the Belchertown skin. 

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