There are a few things to keep in mind when you are storing your scotch, unopened or not. Three are three main elements you want to minimize contact to in order to prolong the longevity of your precious Scotch: light, air and heat.
How does light affect Scotch? Scotch is generally stored in lighter colored bottles, usually clear, to show of its amazing radiant color. Similar to beer, light damages the quality of scotch and can speed up the deterioration of the drink. If you have bottles that are clear, consider storing them in their boxes, or at the very least at the back of the cabinet where light permeates the least.
How does air affect Scotch? Coming in constant contact with air can result in oxidation, which can affect the flavor and texture. Close the bottle cap tightly after pouring a drink, and try to finish the bottle as fast as possible.
How does heat affect Scotch? A higher temperature will result in faster evaporation if the seal of the cork is not 100%. Unlike wine, Scotch does not mature in the bottle, so there's really not an "ideal temperature" to store it. Keep scotch away from direct sources of heat, and consider storing bottles in a cool place where temperature fluctuations are kept to a minimum. There are no hard and fast rules about how fast you should consume scotch after the bottle has been opened. A year seems like a good general guideline, but if stored properly, scotch will keep much longer than that.
Keep it classy, my friends.