I carry my readers with me all year round, and our weather ranges from -10° to up to mid-90°s F. Occasionally lower and higher, but I usually won't go out on those days. I just keep my reader in a sturdy cover to protect the glass and either in my pocket or a very small purse. I'll also read outside in the low teens to 90°F and I've never had a problem with the weather and moving in and out of buildings, trains, cars, etc.
Looking at that screenshot I have a hard time believing it was only a temperature change that caused it, that screen looks shattered. Unless you took a 90° reader and popped it into the freezer.
My readers have all been 5" and 6" readers as well, nothing larger.
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