While 55F is generally touted as the ideal temperature to store wine (both red, white and sparkling) please know that there is no consensus among the experts (winemakers, critics and/or oenological academics). It would be more accurate to say that an acceptable temperature range exists, largely informed by historical local customs. Excluding obvious outliers, that range would be between 55F to 60F.
As a trained Sommelier working with valuable wine collections all over the world, I have found that the actual temperature choice—provided it is held stable within the range listed above—is more a matter of personal.
Finally, please note that our wine cellars are designed to operate at a range of 55F to 58F provided that the ambient environment surrounding the wine cellar meets certain conditions (maximum 55F dew point).