Temperatures and weather within the park vary greatly by location.
Temperatures on the North Rim are often 20 to 30 degrees F (11 to 16 degrees C) cooler than at the river. This is a land of extremes. It can be snowing at the rim, while others are comfortable sunbathing at the the river.
Conversely, it can be cool and comfortable at the rim in the summer, while temperatures at the river exceed 120 degrees F (49 degrees C).
It is not unusual for local canyon guides to encounter neophyte hikers in desperate shape. Some die.
An unusual number of fatalities occur among young males who overestimate their abilities.
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