I don't know, but I had read somewhere at some point that they should be stored at above 40*F but perhaps somebody just misinterpreted it and that's just the threshold you should try to avoid when driving.
I did a quick search though and all I came up with was this:
Quote:
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Unlike less highly tuned tires, Yokohama's care instructions specify that due to its compound characteristics, ADVAN Neova AD07 must be used and stored at temperatures above -10° Celsius (14° Fahrenheit) to maintain its performance and avoid tire damage.
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http://forums.nasioc.com/forums/show...3730&t=1007220
That's for a different tire, but it does illustrate that at some point, low temperature can negatively effect the compound, presumably permanently.