Be aware that whatever the season, if you're at a high altitude, the weather can change quickly and dramatically. Temperatures The coldest month in Austria is usually January.
However, while many (but not all) canyons are found offshore from major rivers, subaerial river erosion cannot have been active to the water depths as great as 3000 meters where canyons have been mapped, as it is well established (by many lines of evidence) that sea levels did not fall to those depths.anyons cutting the continental slopes have been found at depths greater than 2 km below sea level. Many submarine canyons continue as submarine channels across continental rise areas and may extend seawards for hundreds of kilometres onto the abyssal plain.
Colca Canyon, Peru Colca Canyon (CaÃ±on del Colca) in Peru is one of the deepest canyons in the world. At more than 11,330 feet (3,400 meters), it descends to a depth almost twice that of Arizona's Grand Canyon. The canyon developed from a fault that has been eroded for millions of years by the Colca River, which runs more than 124 miles (200 kilometers) along the Peruvian coast.