Most equipment comes with temperature specifications. For example, here
are the environmental specifications for my IBM Thinkpad T22:

- Operating: 5 degrees to 35 degrees C (41 degrees to 95 degrees F)
(without diskette)
- Operating: 10 degrees to 35 degrees C (50 degrees to 95 degrees F)
(with diskette inside unit)
- System off: 5 degrees to 43 degrees C (41 degrees to 110 degrees F)
- Storage/shipment: -20 degrees to 60 degrees C (-4 degrees to 140
degrees F)