When it is summer in Maryland (Northern Hemisphere: June–August), it is winter in Argentina (Southern Hemisphere: June–August).
| Month | Maryland (NH) | Argentina (SH) |
|---|---|---|
| Dec–Feb | Winter | Summer |
| Mar–May | Spring | Autumn |
| Jun–Aug | Summer | Winter |
| Sep–Nov | Autumn | Spring |
Earth's axial tilt (23.5°) causes opposite hemispheres to lean toward/away from the Sun at opposite times of year. Maryland (~39°N) and Buenos Aires (~34°S) experience mirrored seasons.
Maryland summer = Argentina ski season (Bariloche, Chapelco). Maryland winter = Argentina beach season (Mar del Plata, Patagonia summer). Plan accordingly.