In my experience, nearly all C. baccatum cultivars are more tolerant of both cool/cold weather above freezing and also frost itself than any annuum/frutescens/chinense cultivar. Most C. baccatum cultivars also recover better in Spring than any of the other five domesticated chile species from prolonged winter temperatures at or no more than 1-2 degrees below freezing. As long as no actual frost is involved, C. pubescens seems to be the most tolerant of all domesticated chiles to cool/cold temperatures; they'll flower and produce fruits all winter if no frost. As I get more experience with C. pubescens, I keep dropping my estimate of their preferred ambient temperature, and this is where I'm at now: I believe 40 F. for most of the night is cold enough to interfere with flowering, above 80 F. for several hours a day is too hot, inbetween 40 and 80 is fine, and best is a constant temperature of 50-60 'round the clock. But even a light frost seems to kill leaves and flowers of C. pubescens. And prolonged temps between, say, 32-35, even though never actually down to freezing, seem to sometimes be too much for C. pubescens. I suppose a big factor is size and general health/vigor of the plants involved. Latitude may be relevant to how C. pubescens performs at any given ambient temperature (but I don't know -- all my experience has been at a single latitude). --- Brent