40-50% humidity is ideal during flower. if it is too dry or humid then the stomata (pores) on the leaves close and respirate less. this also happens when temps go too high. imo 70-80% is ideal temp but watch your plants and see if they like it cooler or warmer by watching the plants response. stare at your plants as long as you can eventually you will be able to "hear" them "tell" you what they need based on their appearances.