Fine art should be kept in temperature controlled areas, therefore time of shipping is critical in making sure your new artwork arrives safely.  Intense temperature shifts of heat or cold can affect clay artworks by causing expansion cracks, therefore shipping of sculptures may be delayed due to weather.  Any purchasers will be kept up to date on any delays, and your patience with this process will be highly rewarded with the arrival of a flawless art piece!
Typical room temperatures of houses and offices are no issue for clay sculptures, even with bases, even with a bit of a temperature swing from open windows, etc.  As long as your plumbing isn't freezing, your sculptures will be just fine!