Northwest

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This region was defined in the National Climate Assessment (2014) and includes the states of Idaho, Oregon, Washington.

NIACS Unit
Street trees
Residential
Multi-family residential
Commercial/ Industrial
Park
Cemetery
Golf course
Agriculture
Vacant
Institutional
Utility
Water
Transportation
Other
Crop
Range
Pasture
Agricultural facilities and infrastructure
Agricultural tree plantations
Associated agricultural lands
Non-agricultural rural developed land
Non-agricultural designated protected area
Riparian
Infrastructure
Wetland
State
Idaho
Oregon
Washington
Vulnerability Assessment
National Climate Assessment (2018) - Northwest
Climate Impact Statements
Temperatures in the Northwest are projected to increase by 4.9 to 8.5 degrees Fahrenheit by late-century (2071-2100).
By the middle of the century, the Northwest region is expected to experience 3 to 18 more days per year with a maximum temperature exceeding 95 degrees F, and the hottest day of the year is projected to warm by 6.25°F.
The Northwest region is expected to experience between 5 and 30 fewer days per year with a minimum temperature below 10 degrees Fahrenheit by the middle of the century, and the coldest day of the year will warm is projected to warm by 7.33°F.
Climate conditions will continue to increase wildfire risks in in the Northwest by the end of the century.
By the end of the century, average annual precipitation is projected to increase slightly in the Northwest, along with increased year-to-year variability in precipitation.
The number of days per year with more than 1 inch of precipitation will increase across the Northwest by the middle of the century.
The freeze-free season is expected to increase by 20 to 40 days in the Northwest by the middle of the century.
Warmer temperatures, reduced snowpack, and greater water demand for agriculture may reduce available water for natural ecosystems.
Climate change will amplify many existing stressors to forest ecosystems in the Northwest, such as insect pests, tree diseases, and wildfire.
Many tree species and ecosystems in the Northwest may decline under climate change.
The urban heat island effect can exacerbate the effects of increasing temperatures.
Impervious cover can exacerbate the effects of increased heavy precipitation events in urban areas.
Low-diversity systems are at greater risk from climate change.
Systems that are more tolerant of disturbance have less risk of declining on the landscape
Species in fragmented landscapes will have less opportunity to migrate in response to climate change.
Systems that are limited to particular environments will have less opportunity to migrate in response to climate change.
Resource
Third National Climate Assessment – Northwest
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