Effects of Colder weather on timing?

[chevychic]

Does cold weather affect timing quite a bit?

The past week or so, it's been mild here, about 70° - 80°. Then today it plummeted to 50° and rained a bit... (ok so maybe it didn't plummet, but daaaang was it cold compared to yesterday )

Today my truck ran rougher than it has since I installed my distributer and dialed in the timing. It seems to have a slight miss again. It also started doing it's missing thing on the freeway this evening. The way it was before I installed the distributor but not as bad. I have to admit, I was driving it faster than I normally do and after a bit, I could feel it start to run a bit rough so I backed off a bit. But even after I stopped and it cooled down for a few hours, the miss that appeared today with the cold weather was worse.
I'm going to go out tomorrow and play with the timing a bit to see if I can't get it running smoother.

Anyone have any input to how/if the change of weather is affecting it?