The highly varied topography and climate patterns in the park complex have produced a wide variety of ecological niches, which have been filled by a vast array of vegetation types. Large quantities of snow fall in winter, especially at higher elevations, and snow can persist from late autumn to well into spring in most parts of the complex and even in summer at the highest elevations. Elevation significantly affects both temperatures and precipitation levels, with temperatures falling and precipitation levels generally rising as height increases. Summertime highs in July and August average in the upper 70s F (about 25 ☌) at Diablo Dam and in the low to mid-80s (about 28 ☌) at Stehekin, and lows average about 4 ☏ (2.2 ☌) higher at Diablo Dam than at Stehekin through the winter months. In addition, temperatures are somewhat milder at lower elevations in the northwest-central area than in the southeast. Diablo Dam on the Skagit River, in the east-centre part of the region, receives some 75 inches (1,900 mm) of precipitation annually, while roughly half that amount falls at Stehekin at the north end of Lake Chelan. As a result, conditions tend to be wetter in the northwestern and central areas than in the southeast. The Cascades constitute a climatic barrier to the prevailing moist weather systems moving eastward from the Pacific Ocean. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Ĭlimate patterns in the park-complex region can vary greatly, depending on location.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. ![]()
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