The ideal temperature to store wine is 55ºF, and the ideal humidity is 70%.
Wine requires a constant temperature while in storage. Large fluctuations in temperature can damage the wine. At lower temperatures, the flavors in wine take too long to develop. At higher temperatures, wine ages at an accelerated rate. Most experts agree that 55º is the ideal temperature.
The right humidity is also important for wine storage. A 70% relative humidity will help keep the cork soft in order to seal oxygen out. If the air is too dry and the cork dries out, exposure to oxygen will prematurely age the wine. If the air is too humid mold can form on labels. Too much humidity can also damage the cork, and the smell of the cork can seep into the wine.