No particular time of the year, but is usually stronger during the day.
Normally up river - from the sea, north to south
The wind pushes it upward.
the river runs south to north
White Nile, Blue Nile and Atbara River.
The White Nile and the Blue Nile.
The wind can blow in any direction.
By boat
up your bum
true
yes
true
The Blue Nile and the White Nile