Once you already have a good gist of your humidity range in your area over the seasons, assuming you live in a relatively humid area, and AFTER you've already had a digital humidity monitor, then I don't think it's always needed.
For newbies in the hobby though, it's definitely necessary to even find out what your humidity is, and whether it's too high or too low.
I'm in Los Angeles, and the humidity in my apartment is always 55%~70%.
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