Thanks for tagging me! As Matthew mentioned, the issue appears to be that non-standard attributes are not being automatically subscribed to since they aren't part of a standard capability. Unfortunately, there's not a Thing Capability that specifically defines attributes like weather, forecastIcon, percentPrecip, etc. otherwise the device drivers could just be tweaked to add these capabilities.
The good news is we believe we have a path forward to resolution and are actively working on it. 
