How cold is it at the top of Mt Everest in day?

The average summit temperature on Mount Everest is -29 degrees Celsius/-20 degrees Fahrenheit. However, temperatures can regularly dip below -63 degrees Celsius (-80 degrees Fahrenheit). For example, the recorded lowest temperature on Mount Everest was -62.8 degrees Celsius (-81 degrees Fahrenheit) on the 1st of February, 1999.