I'm in SoCal.

I wish it were as easy as one set range I use but in truth it changes with each cycle change. I'm not talking about just vegetation cycle and flower cycle but the in-between periods as well. You change the nutrient strength every week so why not tweak the environment to match? I believe it's best for the plant if you do but I am still collecting data of what percentage at what cycle. The results so far are amazing but that's just my opinion.

For vegetation you are good up to 80% for the first 3 weeks or so. A good mister on a cycle timer is great for foliage spray and to keep the humidity high.

As the plant matures into flower cycle bring the humidity down by about 10% as week until you hit 40% then you can finish with that just fine. Watch for mold or other problem it can bring (it's worth the hassle) and a good Sulfur vaporizer takes care of any of those problems.

A good dehumidifier has built in settings to control the humidity so you need to change it manually.