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This prevailing pattern breaks down occasionally when dense cold air flows down the Columbia Gorge into the Willamette Valley and lowers temperatures more than usual from Portland to Eugene. [7] Oregon has a wide range of temperatures, though the extremes are rare. [3] The highest was recorded on July 29, 1898, in Hermiston, Oregon, and again ...
The 2021 Western North America heat wave was an extreme heat wave that affected much of Western North America from late June through mid-July 2021. [5] The heat wave affected Northern California, Idaho, Western Nevada, Oregon, and Washington in the United States, as well as British Columbia, and in its latter phase, Alberta, Manitoba, the Northwest Territories, Saskatchewan, and Yukon, all in ...
The lowest overnight temperature ever recorded was −3 °F (−19 °C), [86] on February 2, 1950, [87] while the lowest daytime high temperature ever recorded was 14 °F (−10 °C) on December 30, 1968. [87] The average window in which freezing temperatures may occur is between November 15 and March 19, allowing a growing season of 240 days. [87]
Limit exposure to the sun from 10 a.m. to 6 p.m. when temperatures are hottest, and avoid direct sunlight. Schedule outdoor activities in the early morning and late evening.
The Willamette Valley is gearing up for extreme temperatures at or over 100 degrees in the coming days as the incoming heat dome will bring the warmest weather the area has seen so far this year.
The climate is characterized by hot, dry summers and cool, wet winters. The average temperature throughout the year is 55.4 °F (13.0 °C), with the highest average temperature in July and August being 70.8 °F (21.6 °C), and December being the coldest month with an average temperature of 41.8 °F (5.4 °C).
Consequently, Portland experiences heat waves on rare occasion, with temperatures rising into the 90 °F (32 °C) for a few days. However, on average, temperatures reach or exceed 80 °F (27 °C) on only 56 days per year, of which about 12 days will reach 90 °F (32 °C) and only 1–2 days will reach 100 °F (38 °C).
July and August are the warmest months with an average high temperature of 87 °F (31 °C), while December is the coolest month with an average low of 34 °F (1 °C). [51] December is also on average the wettest month with 6.67 inches (169 mm). [ 51 ]