Debre Birhan: are you wondering about the weather you might find during your holiday? Befor organizing a holiday we always think about the wheather we might find when we get there. In Debre Birhan the average yearly temperature is 13°C. During the hottest month, which in this case is May, the temperature can get up to 16°C. Instead the coldest month is November, reaching a minimum temperature of 11°C.