San Diego - Coldest Decades





The coldest decades on record are ranked here for San Diego, California. The lists include decades when San Diego had the lowest average temperatures, and the fewest hot days. These extremes are for temperatures observed at San Diego's International Airport and cover eight decades, from the 1940s to the 2010s.

That is when San Diego 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. Links to the data behind these lists are in the References section on this page.

Coolest High Temperatures

Average daily maximum temperature at San Diego
High °F Decade High °C
Lowest 69.3 2000s 20.7
Runner-up 70.2 1990s 21.2

Coldest Low Temperatures

Average daily minimum temperature at San Diego
Low °F Decade Low °C
Lowest 54.7 1940s 12.6
Runner-up 55.9 1960s 13.3

Fewest Warm Days

Total days per year on average when San Diego had temperatures of at least 70 °F (21 °C)
Days Decade
Lowest 172 2000s
Runner-up 189 1960s

Fewest Hot Days

Total days per year on average when San Diego had temperatures of at least 90 °F (32 °C)
Days Decade
Lowest 2 2000s, 1990s, 1940s
Runner-up 3 1960s, 1950s
References

Current Results. 2020. San Diego 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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