of course you can.

1. STOP WEEWX AND 
2. MAKE A COPY OF THE DATABASE 

FIRST!!!!

3. use sqlite3 to execute commands such as

UPDATE archive SET rain = rain/10 WHERE dateTime >= xxxxxxxxxxxx;
where xxxxxxxxxx is the datetime stamp of the first record where you want 
to start making the changes


4. RESTART WEEWX


and you need to either use wee_database to --drop-daily  and 
--rebuild-daily  or edit the summary tables directly in a similar manner to 
the archive table (harder)



On Saturday, 23 December 2017 09:00:28 UTC+2, Alexandros Bagos wrote:

> The question now is: can I easily correct the past two months which are 
> wrong?
>
> Can I modify the records in the sqlite db with a formula to divide rain by 
> 10?
>

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