is there any information in the log when you restart?

what kind of station?

which amount of rain is wrong - today, this week, this month, this year??

what is recorded in the database?

usually the answer to problems can be found in the log and the log is 
always the first place to look.

when weewx starts up it tries to retrieve data from the weather station 
between the last recorded archive record and the current time - so the time 
on the station AND ON THE PI must be correct.  If you are using the fake 
hardware clock you are probably asking for trouble.  Weewx should not be 
started until the rpi has got the correct time set.  Later versions of 
weewx are pretty good at this - but the issue is only really resolved by 
having an RTC installed.

Sorry to waffle on a lot - start with looking at the log.



On Saturday, 27 July 2019 11:23:38 UTC+3, Jlou 43 wrote:
>
> I use weewx version 3.5.0 on a raspberry pi3 and I have a problem with the 
> amount of rain: when weewx restarts or when the raspberry restarts, I do not 
> know too much, the amount of rain is multiplied by 2, by 3 ...
>
> Do you have any idea where this may come from?
>
> Thank you.
>
>

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