In 1985 the law of Argentina extended the use of the sun emblem in the center stripe of the flag. Argentina has a mild climate. The north has the highest temperatures, and the south the lowest. Argentina lies south of the equator, and so its seasons are opposite those in the Northern Hemisphere. Summer lasts from late December to late March, and winter from late June to late September.
Rainfall is plentiful in northeastern Argentina but decreases toward the west and south.
During winter, stationary fronts bring long rainy periods. Dull, gray days and damp weather characterize this season. Between winter storms, tropical air masses make incursions southward and bring mild relief from the damp cold. The northwest boundary with Bolivia lies in the Gran Chaco and the Andes Mts. The western boundary with Chile follows the crestline of the Andes.