Jennifer you can buy semps in winter just keep them on a cold windowsill!!
Or directly outdoors!
Jackie, I would say be careful when placing them in full sun (not too many hours the first couple of times! So moving them in and out of sun for a week or so) In MI you can have "cold snaps" overnight, and this is what would really hurt them, so I'd say keep an eye on the weather, if your nighttime lows are only going to be in the 20s F then they'll be fine. Moving them outside during the day, and then back in for the night is another possibility, again trying to keepthem on the dry side, so if its raining out, give them some cover...it really is like Twit says "a balancing act" or a science project, collecting a bunch of data and then putting it to work!
