Longer development time, but Fuji doesn't recommend using it below 15C.
From their website:
This film is designed for use at temperatures be-
tween 15∞C and 35∞C (59∞F and 95∞F), but yields best
results at 25∞C (77∞F).
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The table below provides the development times for
this film according to encountered temperatures.
For best results, be sure to observe the following de-
velopment times and temperatures after pulling out
the film sheet. Do not attempt to separate the nega-
tive and positive sheets before the temperature
specified times indicated below have elapsed.
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There is no need for exposure compensation with
general subjects when exposure takes place within a
15∞C to 35∞C temperature range.
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If development times are shorter than specified or
longer than 8 minutes, undesired photos may result.
Here's a link to the pdf, with a temp/time chart:
http://www.fujifilm.com/products/instant_photo/pdf/fp_3000b_datasheet.pdf