Portland - Coldest Decades





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

That is when Portland 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 Portland
High °F Decade High °C
Lowest 61.2 1950s 16.2
Runner-up 62.0 1960s 16.7

Coldest Low Temperatures

Average daily minimum temperature at Portland
Low °F Decade Low °C
Lowest 43.6 1950s 6.5
Runner-up 43.7 1960s 6.5

Fewest Warm Days

Total days per year on average when Portland had temperatures of at least 70 °F (21 °C)
Days Decade
Lowest 110 1950s
Runner-up 116 1960s

Fewest Hot Days

Total days per year on average when Portland had temperatures of at least 90 °F (32 °C)
Days Decade
Lowest 8 1950s
Runner-up 9 1960s

Most Freezing Days

Total days per year on average when Portland had temperatures of 32 °F (0 °C) or lower
Days Decade
Highest 45 1950s
Runner-up 44 1970s, 1960s
References

Current Results. 2020. Portland OR 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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