I know this thread is dead, but oh well.

My own speeds on cold winter mornings vary by day - it doesn't make any sense to me. I even got off my bike to check tire pressure a few times, convinced I had a flat because pedaling was so difficult. I think it came down to dense air, wind, and I might have been tired from my workout the night before.

And for the sake of consistency:

Help, help, I'm being repressed! Did you see him repressing me? You saw it, didn't you!