Because Brazil lies in the Southern Hemisphere, the seasons of the year are exactly the opposite of those in the Northern Hemisphere (North America and Europe)
 

spring	primavera (September 22 to December 21 )
summer	verão (December 22 to March 21)
autumn/fall	outono (March 22 to June 21)
winter	inverno (June 22 to September 21)
rainy season	estação chuvosa
dry season	estação seca