The Elder Scrolls may be a fantasy setting but it's not as if general logic and reason have been tossed into oblivion. The question posed by this thread is not unreasonable or out of place. Though it may not be be a factor in-game, it is stated in lore that Argonians have difficulties in the colder parts of Skyrim due to their reptilian nature. I'm sure there will be a good explanation concerning the spiders.
One of the few replies I actully considered reasonable. At this point I dont mind so much that many want the spiders in the game, but just to which lengh they go to make it easy for themself.
'It is fantasy, so logic don't have to apply' is really not a great reason, at that point. Most off all when at the same time there are many tiny things that people do ask about, and which they back up with tiny logical points. (Don't get me wrong, I don't mind a lot of tiny suggestions based on tiny logical points. (Bee's, and should they react or even be able to kill because some can, is the only one that comes to my mind atm, but there are and were far more)) But you can't just make some things super realistic, then ignore an explanation for others.)
(Again, not ever responds was devoid of trying to use reason, I agree with the cave answere for one, but this is mainly in respons to the ones who just said 'Its fantasy and I win')
Anyway, I admit, spiders are in and we have to live with it.. but we are still free to ask questions.