What's the best temperature for serving wine?
As a general rule of thumb:
Red wine, 65 degrees (F).
White & rosé wine, 55 degrees (F).
Champagne & other bubbly, 45 degrees (F).
To get to those temperatures reds can normally just be kept in a cool cellar or closet. This is also called "cellar temperature." Whites and rosés can be put in the fridge for a few hours, and the bubblies longer.
It is actually easier to use an ice bucket though. Fill the bucket up with ice about 4/5ths, cover the ice with water. If the "room" temperature of your reds are over 65 degrees, immerse them for five minutes; whites and rosés for ten minutes; and bubblies for fifteen to twenty minutes. (Light reds such as Bardolino, Valpolicella, Nouveau and plain ole Beaujolais, and others of that weight should soak nearly as long as the whites.)
Here is a Wines.comTV video on wine storage, including answers to basic questions on temperature, humidity and light.