San Diego CA Coldest Decades

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.