According to the experts at Pommery there are four golden rules when it comes to storing Champagne – especially if it is a special Cuvée or vintage Champagne you wish to age. 1. Store the bottle horizontally. 2. Somewhere dark, most definitely no direct sunlight. 3. A constant temperature – anywhere between 13 to 18 degrees, as long as there are no highs and lows. 4. Humidity helps keep the cork from drying out.