freezing spiders

Spending hours out walking in the cold today, I noticed that spiders' webs are looking really strange these days. I saw lots of webs that were a quite a few threads short of the usual beautiful symmetry:





So I'm wondering whether the cold weather clogs up their spinning ducts, or dampens their motivation. "Can't be bothered with geometry today, it's too freaking cold" I hear them mutter. Just a random thought. May have to ask our local spider expert about this.