Seattle - Temperature Averages by Decade





Summarized here are the temperatures extending over seven decades at Seattle, Washington. Listed for every decade from the 1950s 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 Seattle—Tacoma International Airport.

High Temperature for Each Decade

Average daily maximum temperature at Seattle
High °F Decade High °C
61.1 2010s 16.1
59.5 2000s 15.3
60.4 1990s 15.8
59.6 1980s 15.3
59.3 1970s 15.2
59.2 1960s 15.1
58.1 1950s 14.5

Low Temperature for Each Decade

Average daily minimum temperature at Seattle
Low °F Decade Low °C
46.4 2010s 8.0
44.9 2000s 7.2
45.3 1990s 7.4
44.5 1980s 7.0
44.7 1970s 7.0
44.3 1960s 6.8
42.4 1950s 5.8

Hot Days per Decade

Total days per year on average when the temperature in Seattle reached at least 70 or 90 °F
Decade 70 °F
21 °C
90 °F
32 °C
2010s 102 6
2000s 85 3
1990s 95 3
1980s 83 3
1970s 86 4
1960s 83 3
1950s 75 2

Cold Days per Decade

Total days per year on average when the temperature in Seattle dropped to 0 or 32 °F or lower
Decade 0 °F
-18 °C
32 °F
0 °C
2010s 0 22
2000s 0 28
1990s 0 27
1980s 0 31
1970s 0 31
1960s 0 32
1950s 0 48
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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