Adapted from Keeping Food Safe During an Emergency (USDA).
Is food in the refrigerator safe during a power outage? It should be safe as long as power is out no more than 4 hours. Keep the door closed as much as possible. Discard any perishable food (such as meat, poultry, fish, eggs, and leftovers) that have been above 40 °F for over 2 hours.
For more information, please click on the following link http://www.foodsafety.gov/keep/charts/refridg_food.html