I asked this question a while ago because I remembered a study done. I have had a bit of time to check that out and there is a study that has determined in pine snakes that yes it does. I also found references to the same being true with Childrens pythons as well but that was based on the same study with pine snakes so with out exact studies having been done it is hard to say if that is accurate or not.
here is the ref for the pine snake article.
"Effects of incubation temperature on hatchling pine snakes: implications for survival" J. Burger
http://www.springerlink.com/content/95g8m6mhbq9m4mtn/
http://www.jstor.org/pss/2461904
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