San Francisco - Coldest Decades





The coldest decades on record are ranked here for San Francisco, California. The lists include decades when San Francisco had the lowest average temperatures and the fewest hot days. These extremes are for temperatures observed in downtown San Francisco and cover ten decades, from the 1920s to the 2010s.

That is when San Francisco had weather measurements that are consistent and complete enough to compare decades. Each decade comprises a standard 10-year range. For instance, the 1990s includes measurements from Jan 1, 1990 to Dec 31, 1999. An exception is the 2010s which so far includes data to the end of 2018. Links to the data behind these lists are in the References section on this page.

Coolest High Temperatures

Average daily maximum temperature at San Francisco
High °F Decade High °C
Lowest 62.2 1960s 16.8
Runner-up 62.4 1970s 16.9

Coldest Low Temperatures

Average daily minimum temperature at San Francisco
Low °F Decade Low °C
Lowest 50.7 1950s 10.4
Runner-up 50.8 1920s 10.4

Fewest Warm Days

Total days per year on average when San Francisco had temperatures of at least 70 °F (21 °C)
Days Decade
Lowest 45 1940s
Runner-up 50 1960s, 1950s

Fewest Hot Days

Total days per year on average when San Francisco had temperatures of at least 90 °F (32 °C)
Days Decade
Lowest 1 1960s, 1950s, 1940s
Runner-up 2 2010s, 1930s, 1920s
References

Current Results. 2019. San Francisco CA Temperature Averages by Decade

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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