As said in one of the posts above, the humidity level in the sim has no impact on visibility.
In the real life, more humidity means scattered light, and causes hazy effect.
However in the sim, humidity seems to have little on no difference than 0 humidity.
@DementedCorn327 did you have any luck with debugging? We eagerly await to see if same results are present in MSFS2024 also. Also, do look into the humidity parameters too.