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I would have thought otherwise. Shouldn't it's capabilities be slightly affected between day and night? The ambient temperatures during the day are higher so there's less of a temperature difference, resulting in a lower gradient on the display so it'll be harder to make out shapes. Night should be easier because everything's cooled down some, so it's easier to pick out the signatures of body heat against a colder backdrop.
I'd expect this is addressed in good units (probably through programming by using the ambient temperature as a base and using the maximum and minimum temperature range as a max-min for the display gradient) and will only be a very small performance difference, but I'd kind of like to know the answer too.
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