Hi Tom,

OMM have a standard method to calculate Tn, Tx, RR, etc. It is World 
Meteorological Organization if you don't know in English. 

Weewx calcule each day from 00AM to 00PM but WMO (OMM in French) say that : 


TN: 6 p.m. UTC the day before until 6 p.m. UTC the same day
TX and RR: 6h UTC the same day at 6h UTC the next day
Wind / Insolation / Cloudiness / Pressure: 0h UTC the same day at 0h UTC 
the next day

So much people who comes from Europe that I talk with would like to have 
this option in sql database. 

Le mardi 5 mai 2020 23:37:51 UTC+2, Tom Keffer a écrit :
>
> Sorry. Can you give us more details? I do not know what the OMM standard 
> is. And, I don't know what you mean by "Weewx calculate each 00AM to 00PM"
>
> On Tue, May 5, 2020 at 9:07 AM Florentin Prevost <[email protected] 
> <javascript:>> wrote:
>
>> Hi,
>>
>> I would like to know if it possible in futur to add in database values 
>> from OMM standard. At the moment, Weewx calculate each 00AM to 00PM. 
>>
>> Some users that I can talk with, would like to have this option on Weewx. 
>>
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