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When to Go
Remember that when it's summer in the United States, it's winter in Argentina, and vice versa. Winters (July-September) are chilly, though temperatures never drop below freezing. Summer's muggy heat (December-March) can be taxing at midday but makes for wonderful, warm nights. During these months Argentineans crowd resorts along the Atlantic and in Uruguay. Meanwhile, traffic-free Buenos Aires has a host of city-sponsored concerts and theater that bring people out into the sun and moonlight.
Spring (September-December) and autumn (April-June), with their mild temperatures—and blossoms or changing leaves—are ideal for urban trekking. It's usually warm enough for just a light jacket, and it's right before or after the peak (and expensive) seasons.
The best time for trips to Iguazú Falls is August-October, when temperatures are lower, the falls are fuller, and the spring coloring is at its brightest. Between December and February the heat at the falls can be suffocating.
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