Refrigerators and freezers motors tend to run longer in the summer months to maintain optimum temperature. In some cases they tend to be more warmer inside in the summer months then in the winter months.
Refrigerators should operate between 2.2 and 7.2 degrees Celsius. The optimum temperature your refrigerator should be set at is 4.4 degrees Celsius. Refrigerators set at lower temperatures risk freezing some items, especially those closer to fan. Other then fruits and vegetables which if possible should be placed in crisper pans. Temperatures between 4.4 and 7.2 degrees Celsius give certain foods a higher risk of spoiling.
The freezer temperatures should be between -23.3 to -12.2 degrees Celsius. The optimum temperature your freezer should be set at is between -17.8 and -15 degrees Celsius.