Actually, this is part of the reason why my drinking habits change with the seasons. I don't drink bourbon on a hot day, because I will want something cool. So I usually drink gin in the peak of summer, because gin works well with just a couple of clean ice cubes.
I drink lighter whiskies, like Scotch and Irish, in the spring and fall. More robust spirits, like bourbons, dark rums, and brandies, I usually reserve for the winter, especially since I usually don't turn on the heat much. Thus, my spirits are slightly cool, usually in the 60's, and my natural gas bill stays low. My heritage is northern German, so cool temperatures don't really bother me!
I will advise against warming your bourbon too much-- if the spirit gets too warm, it will release greater quantities of alcohol vapors, making it far too challenging to nose. At least, that's my experience...