See bin/weewx/engine.py:

class StdConvert(StdService):
    """Service for performing unit conversions.
    This service acts as a filter. Whatever packets and records come in are
    converted to a target unit system.                                          
                                                
    This service should be run before most of the others, so observations appear
    in the correct unit."""

Also, see docs/devnotes.htm:

The general strategy is that measurements are converted by service StdConvert 
as they come off the weather station into a target unit system, then stored 
internally in the database in that unit system. Then, as they come off the 
database to be used for a report, they are converted into a target unit, 
specified by the skin.

> On Aug 5, 2020, at 11:20 AM, Randy <[email protected]> wrote:
> 
> 
> If the DB settings are set to us and the data from the HW is coming in as 
> metric, where is the conversion supposed to occur?
> 
>> On Wednesday, August 5, 2020 at 12:21:43 PM UTC-4, Randy wrote:
>> I am new to weewx.  I have data coming in from my device is coming in as 
>> metric (specifically, temp is C).  I want to display that data as US, F.  
>> The default weewx skin is showing the data as metric values like 20F which 
>> is actually 20C whereas it should be 68F.  Where does this conversion happen 
>> or where do I chance the configuration?
>> 
>> Thank you
>> Randy 
> 
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