Standard commercial IC range is 0 to 70 degC, or 32 to 158 degF. That would be at the chip, not ambient inside or outside the box. IME 40 degC = 104 degF is what is typically specified as an reasonable upper limit for ambient air in the room or around a commercial-grade electronic component (AVR, graphics card, etc.). So, while you are getting up there, it should still be OK.
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