Oregon Chapter
American Meteorological Society

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Past Weather

September 1, 2010

Coldest Portland Summer In 17 Years 

Portland just finished its last full month of summer 2010, and with it comes the distinction of being the coldest "meteorological" summer (June, July & August) in the past 17 years. The last time Portland experienced a summer this chilly was in 1993. This was the exact opposite of last summer, which was the warmest summer on record at the Portland International Airport (1941-2010). This was also the first summer since summer of 1976 (nearly 35 yrs) that all three summer months (June, July and August) recorded back-to-back below normal average monthly temperatures. In fact, Portland has now been below average for five back-to-back months, beginning in April and continuing through August. Either way you slice it, it was a chilly summer by Portland standards. Summer 2010 will also be known as the summer that featured large temperature swings from one extreme to the other, along with morning low clouds that persisted longer than normal.

Here are some additional highlights from the summer of 2010 ---

* 10th coldest June on record at the Portland Airport.  
* Single wettest June ever recorded (1941-2010). More than four and a quarter inches of rain fell. 
* The latest date in history to finally reach 80 degrees for the first time in a given calendar year. That was done on June 12th of this year. The old record was June 9th.

Here are the top 15 coldest summers on record at the Portland Airport (1941-2010) ---

Year

Jun Ave

Jul Ave

Aug Ave

Summer Ave

1954

57.9

63.0

63.3

61.4

1964

58.7

64.5

63.7

62.3

1963

59.9

63.0

66.2

63.0

1955

60.7

63.4

65.5

63.2

1953

58.6

66.2

65.6

63.5

1957

62.0

65.5

64.5

64.0

1956

59.0

68.0

65.4

64.1

1976

60.4

67.2

65.5

64.3

1962

61.6

66.4

65.9

64.6

1949

61.7

65.9

66.5

64.7

1993

62.5

64.3

68.5

65.1

1989

64.2

65.5

66.0

65.2

1980

60.7

68.9

66.4

65.3

2010

60.4

67.5

68.1

65.3

1952

60.3

68.0

67.9

65.4

Steve Pierce
Vice President
Oregon Chapter of the American Meteorological Society (AMS)
503-504-2075 (Portland)
e-mail: stevejpierce@comcast.net