Temperatures and weather within the park
vary greatly by location. Temperatures on the North Rim are often 20-30°F
(11-16°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 river.
Conversely, it can be cool and comfortable at the rim in the summer, while
temperatures at the river exceed 120°F (49°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 people who overestimate their
abilities