I think the percentage of humidity has a much larger effect and is degrading it more. The higher the humidity, the lower the power.
https://youtu.be/OIvVBPCwXAw
https://youtu.be/pzDHRwi3QVk
https://youtu.be/OIvVBPCwXAw
https://youtu.be/pzDHRwi3QVk

