I actually find lower temps advantageous. For one, cooler temps increase female ratios. Also, resin develops in copious amounts, more so then in hot, humid temps, That's been my experience, in any case. Cannabis is a hardy plant and I can personally attest to having a plant in my crawl-space during a
Cold 20 f winter. She continued to flower (slowly) and produced very resinous nuggets. Yield was decreased though, due to the low temps. I really DON'T recommend growing in
Such Cold temps, but mine finally pulled through in the end. Many strains, and obviously; African / Equatorial, or tropical Sativas will not thrive in these temps, but most Indicas / hybrids, Just might.