Portland - Hottest Decades
Ranked here are the hottest decades on record for Portland, Oregon. The lists include decades when Portland had the highest average temperatures, the most hot days and the fewest 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.
Hottest High Temperatures
| High °F | Decade | High °C | |
|---|---|---|---|
| Highest | 63.6 | 2010s | 17.5 |
| Runner-up | 63.4 | 1990s | 17.5 |
Warmest Low Temperatures
| Low °F | Decade | Low °C | |
|---|---|---|---|
| Highest | 46.6 | 2010s | 8.1 |
| Runner-up | 46.0 | 1990s | 7.8 |
Most Warm Days
| Days | Decade | |
|---|---|---|
| Highest | 129 | 2010s |
| Runner-up | 125 | 1990s |
Most Hot Days
| Days | Decade | |
|---|---|---|
| Highest | 17 | 2010s |
| Runner-up | 14 | 2000s |
Fewest Freezing Days
| Days | Decade | |
|---|---|---|
| Lowest | 30 | 1990s |
| Runner-up | 31 | 2010s |
How Much Hotter are 2010s?
Compared with averages for the previous 50 years (1960 to 2009), the 2010s in Portland had:
- 4 more days each year with temperatures of 90 °F and higher
- 0.8 °F higher daily maximum temperatures (0.5 °C)
- 1.6 °F higher daily minimum temperatures (0.9 °C)
- 7 fewer days a year with freezing temperatures
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.