How are these readings possible?
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enu...@gmail.com
May 31, 2021, 5:42:47 AM5/31/21
to weewx-user
If I understand well how weewx works on my station, every 48s a loop packet arrives and I suppose that by making an average of those loop packets every 5 minutes it writes to the database.
How can I have a temperature graph at 20ºC and suddenly find peaks at 43º? That would imply that 6 packets have arrived with data very out of the correct which seems very unlikely, perhaps one for any reason that alters the average somewhat and that I suppose can be filtered with StdQC but how can be saved in the database a temperature of 43 ° C in 5 minutes.
What is the explanation?
Karen K
May 31, 2021, 6:01:35 AM5/31/21
to weewx-user
Is that graph about temperature or some aggregation of temperature? That makes a difference.
You could set debugging to 1 and restart weewx and look into the logging file what it says.
Tom Keffer
May 31, 2021, 7:59:05 AM5/31/21
to weewx-user
In addition to Karen's suggestions, two other questions:
What kind of hardware? Some hardware generate their own archive records.
Where is the sensor located? Perhaps the sun is a factor?
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wfs...@gmail.com
May 31, 2021, 10:09:50 AM5/31/21
to weewx-user
Isn't the standard behavior for things like temp & humidity to record the most current reading at the end of the interval, not the average over the interval? So if you observe a spike at/near the end of your archive interval (legitimate or not), that is the value written to the database?
Tom Keffer
May 31, 2021, 11:31:00 AM5/31/21
to weewx-user
No. Standard behavior is to record the average.
But, like most other things in WeeWX, it can be customized. Accumulators.
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Cameron D
May 31, 2021, 7:37:22 PM5/31/21
to weewx-user
yet another possibility is hardware issues. I recently had sudden spikes to 65°C, but they were more obviously a hardware fault as they were followed by a few minutes of null data.
Suspects might be developing corrosion in contacts, or creatures traversing the circuit boards.
How frequently is this happening to you?
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