Some quick online searches define an operating temperature for slow cookers: the minimum internal temperature is A, the simmering point is B, you have certain options depending on heat setting, etc., and of course you should avoid prolonged time in the danger zone from C to D.
What I haven't been able to find, either in webpages or published product manuals, is what the range of external ambient temperatures a Crock-Pot or other slow-cooker are appropriate usage. I'd imagine that the normal operating cooker's range includes at least most reasonable room temperature for some culture's or economies' opinions about suitable room temperature, and I'd expect immediate, total destruction from attempted Crock-Pot use while the Crock-Pot is bathed in liquid helium or magma.
What I haven't found, however, is a tighter and more useful estimate. The range of temperatures where people are willing to pursue their lives amounts to a pretty broad range, and the range is presumably narrower for people that act on a live option of cooking with a Crock-Pot.
Do Crock-Pots work at most ambient temperatures that at least some people tolerate? If not, what would a more accurate range be?