Not a lot because its in the middle of the Shara Dessert
For 25 years
the average annual rainfall for Egypt is 51 inches per year.
A lot
Its almost 50000mm in a year
Note: I copied this from the answer (also on WikiAnswers) to the question 'What is the average rainfall in ancient Egypt?' Probably similar to present day rainfall in Egypt. Egypt does not have much rainfall except in the winter months. South of Cairo, it averages only around 2 to 5mm a year at intervals of many years. A very narrow strip of the north coast rainfall can be as much as 410mm, Egypt draws most of its water from the River Nile, which floods at a certain times of the year due to the spring thaw of the snow that falls on Sinai's mountains.
Probably similar to present day rainfall in Egypt. Egypt does not have much rainfall except in the winter months. South of Cairo, it averages only around 2 to 5mm a year at intervals of many years. A very narrow strip of the north coast rainfall can be as much as 410mm, Egypt draws most of its water from the River Nile, which floods at a certain times of the year due to the spring thaw of the snow that falls on Sinai's mountains.
Arizona gets an average of 12.7 inches of rain each year.
Egypt receives an average annual rainfall of less than 3.15 inches. During summer, it almost never rains in the country.
Approximately 1200mm per year.
Wisconsin gets 34.49 inches of year on average.
2.17 millimeters (mm) 0.1 inches (in0 19 rain days
According to my research the amount of rainfall the rain forest gets each year is about 600cm.