Smell depends on the strain and growing conditions, flowering cycle will produce more odours. Any thing below 68 degrees and most Kannabis plants will be affected by shock. Frost will kill a Kannabis plant.
Humidity between 30 and 35 is best to avoid mold issues, some strains will mold very easy other do not.

Check out the Strain and Genetic Guides from more then one source @

http://vsite.net/kanman/strainguide.html