Growing Tip:
What range should I maintain for my grow room humidity and temperature?
-- Grow Marijuana Answer

A humidity and temperature gauge are essential in any grow room. Daytime properties should be 70-80 degrees without CO2, 80-90 degrees with CO2 until the last two weeks when daytime temps should be kept between 70-80 and CO2 can be reduced to adjust for the lower METAbolism. Night temperatures should be kept above 60 degrees to prevent stress. It is preferrable during flowering to have a night temperature drop of 10-20 degrees to stimulate flowering hormones and reduce stem elongation.

I find that low humidity causes stress on plants. I recommend 50-60% humidity until the final 2 weeks of flowering. At this point, the humidity should be lowered as much as possible to encourage the plant to seal and protect itself with additional resin. (I am able to get the humidity to go as low as 31%) I have been able to frost things up considerably this way. The higher humidity levels prior to final ripening reduce salt levels within the plant tissue and encourage healthy, more lush growth.