Red and black spiders? If you're in the US, that sounds like you have black widows. If so, be extremely careful. I don't think the snake would care about the spiders.

Also, ball pythons will seek a good hiding place over warmth--they really don't know enough to avoid cold. Their instincts simply aren't wired to deal with it. So he could go down into a cold root cellar, looking for water. If you have a lot of bowls of water around, though, he might not.