The year-round temperature in
Nubia
can vary wildly . During the warm months , from May to September , temperatures during the day often reach 40degrees C . During the remainder of the year , overnight temperatures may drop close to freezing . The northern half of Nubia , north of Dongola , seldom sees any appreciable rain . South of Dongola there is a rain season in July and August . Annual precipitation at Khartoum , where the White and Blue Niles join , averages about 7 inches .
Though severe rainfall is not a disturbance , the prevailing winds can cause problems with agriculture fields and villages . Year-round the winds blow from the north . Because the current of the river flows in the opposite direction , the winds make it possible to navigate the Nile in both directions with ease .
These climactic conditions were probably unpleasant at times , but agriculture fields usually yielded enough food to support the Nubian's .
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