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You'd probably be more likely to run into issues if there was a sudden change in climate while, or just before, the laptop was powered on...
There could be issues with mechanical devices such as CPU fans and HDs starting up in very cold temperatures, but once they're running the residual heat generated by the laptop should keep things warm.
On the flipside, if it's a permanent installation try to figure out some way to shroud or protect it so there's never any direct sunlight on the case.
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