In live in Lahore Pakistan. The climate here is extreme. In May, June and July temperature remains around 40 C. In December and January, during day it is around 17 C and at night it is generally around 10-12 C. During Summer months, some use water desert cooler but many do not. During winter, some fanciers bring their Cockatiel indoor but some keep them in outdoor aviaries however they cover these aviaries with plastic. A few do use heaters. I am interested to know that is it OK for Cockatiel to be kept in outdoor aviaries/cages when day temperature is 17-20 and at night, for some hours, it is 10-12 C? Many fanciers might be living in places where temperature may be the same as here so I would need to know their experience vis-à-vis wintering. What is the lowest temperature which Cockatiel can tolerate.