I don't know if that's the case. There are temperature ranges though, documented by Apple, in which you need to operate your devices. Can't really forbid selling devices in countries with the wrong climate, after all the buyer might be committed to only operate the devices within the documented ranges.
You can’t blame it on the climate just because you have never experienced it.
NB.: How many mac’s are your statistic based upon < 100? I think we need the big numbers...