It is obvious that temperature plays a most critical role in developing films. It is not clear to me, though, what effects temperature might cause at the time of exposure.
I didn't stumble upon any reference to exposure temperature in datasheets of films I personally use. This suggests that there's nothing relevant for the photographer going on. On the other hand, as this is a chemical reaction there should probably be some effect.
I found some suggestions that there might be an effect on the reciprocity error. Are there some reliable sources with data that could prove it?
Is there any effect of high/low temperature on film exposure in negative/positive bw/color film? And if yes, how do you account for these effects? Should I spent a thought on this when going to take photos on film in extremely cold or hot environments?