San Francisco - Temperature Averages by Decade





Summarized here are the temperatures extending over ten decades at San Francisco, California. Listed for every decade from the 1920s 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 in downtown San Francisco.

High Temperature for Each Decade

Average daily maximum temperature at San Francisco
High °F Decade High °C
64.2 2010s 17.9
64.1 2000s 17.8
66.1 1990s 19.0
65.1 1980s 18.4
62.4 1970s 16.9
62.2 1960s 16.8
62.6 1950s 17.0
62.5 1940s 16.9
63.9 1930s 17.7
63.7 1920s 17.6

Low Temperature for Each Decade

Average daily minimum temperature at San Francisco
Low °F Decade Low °C
51.9 2010s 11.1
50.9 2000s 10.5
51.6 1990s 10.9
51.5 1980s 10.9
51.2 1970s 10.6
51.0 1960s 10.6
50.7 1950s 10.4
51.2 1940s 10.7
51.0 1930s 10.6
50.8 1920s 10.4

Hot Days per Decade

Total days per year on average when the temperature in San Francisco reached at least 70 or 90 °F
Decade 70 °F
21 °C
90 °F
32 °C
2010s 67 3
2000s 64 3
1990s 105 4
1980s 91 4
1970s 51 3
1960s 50 1
1950s 50 1
1940s 45 1
1930s 68 2
1920s 68 2

Cold Days per Decade

Total days per year on average when the temperature in San Francisco dropped to 32 °F or lower
Decade 32 °F
0 °C
2010s 0
2000s 0
1990s 0
1980s 0
1970s 0
1960s 0
1950s 0
1940s 0
1930s 1
1920s 0
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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