10 to 15 degrees Celsius is acceptable, with little to no temperature fluctuations. Warm conditions will not only accelerate aging, but may cause undesirable changes in the wine. Cold temperatures will cause the cork to harden, thereby allowing air to seep in and oxidize the wine.
Ultraviolet light can destroy wine, a reason why bottles tend to be darker in colour. Wines prefer a cool, dark resting place.
Strong odours can penetrate the cork and affect the wine. Ensure good ventilation and keep the bottles away from paint, cleaning products and even onions and garlic.
60% to 70% humidity is considered a good range. Lower levels cause the cork to dry out, allowing higher levels of oxygen into the bottle, which in turn destroys the wine.
Remember that your collection will grow over time (at least, we hope it will). If your home has limited space, consider using a wine storage facility. Companies that offer this service ensure climate-controlled environments and often provide 24-hour access. SY