Remember that in the southern hemisphere the seasons are the opposite of those in the northern hemisphere. In general, summer with mild temperatures and long days is the most ideal time to visit Patagonia and the Southern Andes. Wintertime is recommended for traveling to the North and Northwest as the rains are less frequent and the tropical temperatures drop a few degrees. Autumn and spring are marvelous in Buenos Aires, Cuyo and the pre-mountain range areas of La Rioja and Catamarca.