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Mount Jupiter
Mount Jupiter from West Seattle.jpg
Mount Jupiter seen from Seattle
Highest point
Elevation 5,700 ft (1,700 m)
Prominence 1,700 ft (520 m)
Geography
Mount Jupiter is located in Washington (state)
Mount Jupiter
Mount Jupiter
Location in Washington (state)
Mount Jupiter is located in the United States
Mount Jupiter
Mount Jupiter
Location in the United States
Location Jefferson County, Washington, United States
Parent range Olympic Mountains
Topo map USGS Mount Jupiter
Geology
Age of rock Eocene
Type of rock pillow basalt
Climbing
Easiest route Hiking 7.2 mile trail

Mount Jupiter is a mountain in the Olympic Mountains of Washington state. It stands about 5,700 feet (1,737 meters) tall. You can find it in Jefferson County. This mountain is part of The Brothers Wilderness, which is managed by the Olympic National Forest.

Mount Jupiter is easy to spot from Seattle. It looks like a big peak between two other famous mountains, The Brothers and Mount Constance. The name Jupiter was given by explorers from the Seattle Press Expedition. They wanted to connect the mountain to the ancient Roman gods, just like Mount Olympus was named after the home of the gods. Jupiter was the most important Roman god, like the king of the gods.

Weather and Climate

Mt Jupiter from highway 101 on the Duckabush River, Olympic National Forest (32481756446)
Mt Jupiter from Highway 101

Mount Jupiter has a special kind of weather called a marine west coast climate. This means it gets a lot of rain and snow, especially in winter. Most of the weather comes from the Pacific Ocean.

When weather fronts from the ocean hit the Olympic Mountains, the air is forced to rise. As it goes higher, it cools down and drops its moisture. This causes a lot of rain or snow to fall on the mountains. This process is called orographic lift.

Because of the ocean's influence, the snow here is often wet and heavy. This can sometimes lead to avalanche danger. In winter, it's usually cloudy. But in summer, high pressure systems over the Pacific Ocean often bring clear skies.

The best time to go hiking on Mount Jupiter is usually from June to October. This is when the weather is most pleasant. Water from the north side of the mountain flows into the Dosewallips River. Water from the south side flows into the Duckabush River.

Mt. Jupiter from Mt. Constance
Mt. Jupiter from Mt. Constance
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