For your specific case I'd just kick zero wind loop packets out:

windSpeed = None if windSpeed == 0 else windSpeed, loop

The windDir should be "None" if windSpeed is zero anyway, but to be sure:

windDir = None if windSpeed == 0 else windDir, loop


[email protected] schrieb am Mittwoch, 15. Januar 2025 um 18:48:53 UTC+1:

> See: 
> https://weewx.com/docs/5.1/reference/weewx-options/stdcalibrate/?h=stdcalibrate#corrections
>
> [email protected] schrieb am Mittwoch, 15. Januar 2025 um 18:47:38 
> UTC+1:
>
>> Yes it is. I have a station with two Anemometers and I mix them in the 
>> way, that always the higher windSpeed/windGust will be used, if both are 
>> there, or the one that's there. Anemometers freeze or sometime I have 
>> Signal strength issues. I always take the direction of a specific one (an 
>> ultrasonic with heating, that won't freeze), except it isn't there. It's 
>> quite a brainf*ck, but it works. Some other Corrections are also done:
>>
>> [StdCalibrate]
>>     
>>     [[Corrections]]
>>         
>>         radiation = luminosity/126.7 if luminosity is not None else None 
>>    #gw1000 fix
>>         lightning_distance = lightning_distance if lightning_strike_count 
>> > 0 else None
>>         windSpeed = ws90_windSpeed if 'windSpeed' not in locals() else 
>> windSpeed if 'ws90_windSpeed' not in locals() else ws90_windSpeed if 
>> ws90_windSpeed > windSpeed else windSpeed
>>         windGust = ws90_windGust if 'windGust' not in locals() else 
>> windGust if 'ws90_windGust' not in locals() else ws90_windGust if 
>> ws90_windGust > windGust else windGust
>>         windDir = ws90_windDir if 'ws90_windDir' in locals() and 
>> ws90_windDir is not None else windDir
>>
>>
>>
>> Rory Gillies schrieb am Mittwoch, 15. Januar 2025 um 17:53:42 UTC+1:
>>
>>> I know I could just try this but interested to hear if it would work, or 
>>> if I have any other options. WeeWX 5.1.
>>>
>>> Is it possible to use logic in StdCalibrate in weewx.con? Something like 
>>> this:
>>>
>>> [StdCalibrate]
>>>     if windSpeed == 0 windspeed = windspeed + 15
>>>     if windDir == NULL windDir = windDir + 235
>>>
>>> The reason is I have a dying anemometer and it's going to take a couple 
>>> of weeks to get a replacement installed (it's on my chimney 8m above the 
>>> ground). When the wind blows from SSW to WSW above 20mph it sometimes drops 
>>> to zero every few loop packets (other times it is perfect).
>>>
>>> [image: Screenshot 2025-01-15 at 16.49.12.png]
>>>
>>> I know the observations will be technically incorrect but better than no 
>>> wind at all!
>>>
>>>

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