Thank you for your answer.

I use a METRICWX database because I'm in France and we use the metric unit 
system.

Matthias

Le jeudi 15 septembre 2016 19:48:47 UTC+2, Tom Keffer a écrit :
>
> Weewx actually monitors the LOOP packets coming out of your VP2 every 2.5 
> seconds, looking for highs and lows. It's possible that the console and 
> Weatherlink is showing the highest and lowest *archive* records, which 
> have something more like a 5 minute resolution. The difference in values 
> could be due to the difference in time resolution.
>
> No conversion problem, nor setup necessary.
>
> Any particular reason why you are using a METRICWX database? The native 
> units of the VP2 are US Customary, so you could be introducing rounding 
> errors as well. As I keep repeating, unless you are writing a database 
> application that needs metric units, there is no good reason to change the 
> database unit system from US.
>
> -tk
>
>
>
> On Thu, Sep 15, 2016 at 8:57 AM, <matthias.g...@gmail.com <javascript:>> 
> wrote:
>
>> Hello,
>>
>> I see that my extreme values (temp, barometer,etc) are different between 
>> the VP2 console (Weatherlink also) and weewx. There is difference of 0.1 or 
>> 0.2. My database is in METRICWX.
>> Is there a conversion problem or a setup to do?
>>
>> Many thanks.
>>
>> Matthias
>>
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