Portland and much of northwest Oregon reflected global warming trend in 2014 – OregonLive.com
As goes the planet, so went the Willamette Valley, Portland and northwest Oregon and Southwest Washington, racking up numerous warm weather records not only for the summer of 2014, but for the year.
NASA and the National Oceanic & Atmospheric Administration said Friday that in 2014 the world had its hottest year in 135 years of record-keeping.
It wasn’t the hot days so much that prompted hundreds of people to call the National Weather Service in Portland’s public information line last summer to ask if it’s been unusually warm. It was the mornings, which were much warmer than average.
Will Ahue, a weather service forecaster, said many of Portland’s records had to do with those warmer mornings than average overnight lows. Calm overnight winds, a dominant ridge of high pressure and higher than average humidity levels kept low temperatures from dropping into the 50s, he said.
“The Willamette Valley didn’t ventilate overnight,” Ahue said. “So we had very little relief.”
The list of warm weather-related records for Portland and other locations:
Warm mornings: In Portland, there were 50 mornings in the city when the temperature never dropped below 60 degrees, breaking the record of 45 such days. On average there are only 18.
Highest summer average at PDX: Portland, with an average high of 71.2 degrees, had it’s warmest summer (June 21 to Sept. 21) since record-keeping began at Portland International Airport in October 1940.
Average of 56.1 degrees: The average temperature for the year was 56.1 degrees, making it the second-warmest year behind 1992, when the average temperature was 56.2 degrees.
21 days over 90: Portland had 21 days when the temperature reached or exceeded 90 degrees, well above the average of 12 and just shy of the record 24 days in 2009.
Early to 80: The first 80 degree day came on April 30. The average first 80 degree day is May 10.
May starts hot: The high of 89 degrees on May 1 made it the warmest May 1 on record in Portland.
Early to 90: The first 90 degree day came May 14, more than a month earlier than the average date of June 16.
Record August at PDX: August finished as the warmest on record at the airport with an average temperature of 73.1 degrees, breaking the record of 72.9 degrees set in 1967.
Warm nights: August had 22 nights with low temperatures at or above 60 degrees. The month tied the record set a year earlier, in August 2013.
Warmest October: The average temperature of 60.1 in October made it the warmest on record, breaking the old record of 58.6 degrees in October 1952.
Vancouver, Salem, Eugene and McMinnville had their warmest summers or tied for their warmest summers on record, with, respectively, average high temperatures of 70.8 degrees, 71.8 degrees, 70.2 degrees and 70.7 degrees.
Salem had a record 13 days when the temperature reached or exceeded 90 degrees in July.
Eugene had a record 16 days when the temperature reached or exceeded 90 degrees in July.
Salem’s average high temperature in August was 72.5 degrees, breaking the previous August record of 71.6 degrees set in 1967.
— Stuart Tomlinson