Hmm, accoding to the Hardware Guide 
(http://weewx.com/docs/hardware.htm#wmr200_notes) the WMR200 calculates and 
provides windchill to weeWX. So it's likely either the WMR200 driver is 
decoding windchill incorrectly or the station is outputting nonsense windchill 
now and then. Does windchill always display correctly on the station? Probably 
need a WMR200 expert I suspect.

You could force weeWX to calculate windchill by setting windchill=software 
under StdWXCalculate in weewx.conf but this will only give you a windchill 
value when you have non-None values for outTemp AND windSpeed in the 
packet/record. Arguably this is only masking the issue rather than fixing it.

Gary

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