Burkina Faso is predominantly an arid country. The hottest period in general is from March to mid June.
The rainy season starts in June and ends approximately around September. Most rain falls
in the south-west of the country. From June to Januari the temperature is pleasant.
In January and February, the desert storms give a lot of dust in the air. The average
temperature is 30°C, with peaks of 37°C. (http://worldweather.wmo.int/143/c01526.htm).