Looking at your plots it seems you have an archive_interval of 60s (1 
minute). While in my opinion there is no benefit having an archive_interval 
that low, the downsides are a fast growing database, a bad performance and 
kind of ugly plots, espicially with wind, windGust and windDir. The only 
advantage I can think of, by setting a shorter archive_interval than 300s, 
is you get a "more live" view of the currant weather and you don't have to 
wait for the archive_interval plus the time, the report generation and 
upload needs, to view what currently happening.
If you don't want to relinquish having live data despite having an 
archive_interval that is producing nicer plot with a smaller database and a 
good performance: there are different skins that solve this problem. But 
this comes with extra configuration for the skin and things like MQTT for 
the live data.

Anyway: I'd always go for the standard value for archive_interval, which is 
300s.

[email protected] schrieb am Sonntag, 3. August 2025 um 08:27:52 UTC+2:

> With a Vantage Pro 2 weather station, the archive value of the wind 
> direction is the dominant direction observed during  the whole archive 
> interval. Values  are  only N, NNE, NE, ENE, E , ESE, SE, SSE, S, SSW, SW, 
> WSW, W, WNW, NW, NNW
>
> See this document 
> https://cdn.shopify.com/s/files/1/0515/5992/3873/files/VantageSerialProtocolDocs_v261.pdf?v=1614399559
>   
> , page 33
>
> Le samedi 2 août 2025 à 22:37:49 UTC+2, [email protected] a écrit :
>
>> Would someone kindly take a glance at my weatherstation WIND DIRECTION 
>> graph, and tell me if it appears normal?  To me, it looks rather 
>> disjointed.  I wonder whether there is trouble in the vane or in the 
>> direction/speed Sensor Transmitter.
>>
>> Wind today is gentle, generally out of the southeast, averaging under 5 
>> mph.  Rain and wind is forecast later this afternoon.
>>
>> The system is a Davis Vantage Pro2, monitored by weewx 5.1.0.
>>
>> URL is www.alysonwonderland.org
>>
>> RLH
>>
>>

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