According to the scriptures, Jehovah “makes his sun rise upon wicked people and good and makes it rain upon righteous people and unrighteous.” - Matthew 5:45
In that case, if we look at the account in Genesis, God is shown to give Pharaoh a dream that he will cause seven years of famine.
Genesis 41: Pharaoh’s Dreams
25 Then Joseph said to Pharaoh, “The dreams of Pharaoh are one and the same. God has revealed to Pharaoh what he is about to do. 26 The seven good cows are seven years, and the seven good heads of grain are seven years; it is one and the same dream. 27 The seven lean, ugly cows that came up afterward are seven years, and so are the seven worthless heads of grain scorched by the east wind: They are seven years of famine.
28 “It is just as I said to Pharaoh: God has shown Pharaoh what he is about to do. 29 Seven years of great abundance are coming throughout the land of Egypt, 30 but seven years of famine will follow them. Then all the abundance in Egypt will be forgotten, and the famine will ravage the land. 31 The abundance in the land will not be remembered, because the famine that follows it will be so severe. 32 The reason the dream was given to Pharaoh in two forms is that the matter has been firmly decided by God, and God will do it soon.
Note, this wasn't just Egypt where famine happened...
56 When
the famine was spread over all the face of the earth, then Joseph
opened all the storehouses, and sold to the Egyptians; and the famine
was severe in the land of Egypt. 57 The people of all the earth came to Egypt to buy grain from Joseph, because the famine was severe in all the earth.
The JWs teach that God cannot be held responsible for bad things.
http://www.jw.org/en/publications/books/bible-teach/what-is-the-truth-about-god/
7 Worse yet, religious teachers sometimes
lead people to think that God is hardhearted. How so? When tragedy
strikes, they say that it is God’s will. In effect, such teachers blame
God for the bad things that happen. Is that the truth about God? What
does the Bible really teach? James 1:13
answers: “When under trial, let no one say: ‘I am being tried by God.’
For with evil things God cannot be tried, nor does he himself try
anyone.” So God is never the source of the wickedness you see in the world around you. (Read Job 34:10-12.) Granted, he does allow bad things to happen. But there is a big difference between allowing something to happen and causing it.
How would you reconcile what the Watchtower says with what God told Pharaoh?