Portland - Temperature Averages by Decade





Summarized here are the temperatures extending over eight decades at Portland, Oregon. Listed for every decade from the 1940s to the 2010s are averages for maximum and minimum daily temperatures in degrees Fahrenheit and Celsius. That's followed with information on the number of hot and cold days.

Each decade covers a standard 10-year range. For instance the 1990s includes weather measurements from Jan 1, 1990 to Dec 31, 1999. All the temperature data were collected at Portland International Airport.

High Temperature for Each Decade

Average daily maximum temperature at Portland
High °F Decade High °C
63.6 2010s 17.5
63.0 2000s 17.2
63.4 1990s 17.5
62.9 1980s 17.2
62.5 1970s 17.0
62.0 1960s 16.7
61.2 1950s 16.2
62.3 1940s 16.8

Low Temperature for Each Decade

Average daily minimum temperature at Portland
Low °F Decade Low °C
46.6 2010s 8.1
45.8 2000s 7.7
46.0 1990s 7.8
45.2 1980s 7.3
44.4 1970s 6.9
43.7 1960s 6.5
43.6 1950s 6.5
44.6 1940s 7.0

Hot Days per Decade

Total days per year on average when the temperature in Portland reached at least 70 or 90 °F
Decade 70 °F
21 °C
90 °F
32 °C
2010s 129 17
2000s 124 14
1990s 125 13
1980s 122 13
1970s 121 13
1960s 116 9
1950s 110 8
1940s 120 10

Cold Days per Decade

Total days per year on average when the temperature in Portland dropped to 32 °F or lower
Decade 32 °F
0 °C
2010s 31
2000s 34
1990s 30
1980s 38
1970s 44
1960s 44
1950s 45
1940s 43
Reference

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Year, Version 1.0. NOAA National Centers for Environmental Information.

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