I'll try and make it as simple as possible, I break the grow down into 6 loosely defined sections.
1: Rooting phase. When clones are in the dome waiting for roots to pop. I aim for 85%+ humidity and a temp of 75-80f. Last about 2 weeks.
2: Nursery phase. Also called the preveg stage, this is after rooted cuts are transplanted to their first home, either a 3" block in my case, or a red solo cup, or small Nursery pot etc. I aim for 65-70% humidity and temp of 75-80f. I keep them under pretty low light here, usually T5HO flourescents. This stage lasts until the starting container is well rooted, usually about 10-14 days.
3: Vegetative phase: when the plants are removed from the Nursery and transplanted to larger containers or placed on grow slabs under higher powered grow lights. This is when I lower humidity to 55-60% and gradually increase the amount of light, and increase temp slightly to drive transpiration a bit harder. This stage for me lasts 2-3 weeks.
4: Transition phase. The first 3 weeks of 12/12, I'll keep RH in the low 50's and temps high 70's. I also continue increasing light levels incrementally during this period.
5: Mid flower. Rh high 40% temp high 70's. Full light intensity.
6: Late flower: RH as low as possible temps reduced to mid-low 70's and light dialed down to 40%
Hope that helps.