I am using pollster to poll the thermostat and humidity and for a while I got humidity every hour, so I think it is possible. Not sure what I changed (thermostat device type? poll vs refresh?), but now humidity is sporadic. I think pollster should be using refresh, so I just changed it back to that and I’ll see if humidity starts updating in my google sheet log again.
Update: pollster is getting humidity every 60 minutes from my CT100 when I select it under refresh.