Not necessarily true. I live in a place surrounded by chubbies and it is usually about 27 degrees celsius at night, and about 26 degrees celsius when it rains, during and after. These are variable frogs which can likely be kept at a really large range of temperatures. It is 28 degrees celsius in the day typically, but one should note that the chubbies are underground during this period of time. Just so for discussion sake. In the meantime, keep your chubbies at the temperatures determined by other more experienced forum members.