To restore the balance, I now exchanged the yellowed sensor from the sun-exposed south side balcony with the one from the shadowy north side garden.
Should keep it more even in the long run.
Could hit it with hydrogen peroxide and UV light.
I am more concerned about structural and functional degradation (e.g. one of the battery cells seems to have taken a hit during the >>40°C summer periods).
Hydrogen peroxide and more UV exposition unfortunately won’t help with that…
Largely uninteresting bonus observation:
After re-enabling all sensors, something was odd for channel two of the weather station’s three channels.
Through try and error I could determine that the station latched on not to my sensor, but to a foreign one, probably belonging to one of the neighbours.
It seems to be placed outside somewhere, but at a slightly warmer (but unknown) location compared to my own sensors.
