The Operating temperature is specified as:
- 32° to 122°F (0° to 50°C) for CBS250-8T-D and CBS250-8PP-D
- 23° to 122°F (-5° to 50°C) for other models
this is the operating environment (outside) of the switch , the internal temperature may go higher
try the "show environment {all | fan | temperature {status} | stack [switch-number]}" command
maybe the upper temperature limit will show in the output?