Overview
From 1939 to 2025, Portland has experienced significant warming, with the last decade showing a mean temperature of 13.35°C, which is higher than the previous decade's mean of 12.54°C.
The city’s climate data is gathered from multiple stations, including the Portland International Airport.
Portland has warmed by 1.22°C from 1939–1948 to 2016–2025.
Climate Data
The mean temperature for the first decade (1939–1948) was 12.12°C, while the last decade (2016–2025) shows a mean of 13.35°C, indicating a warming of 1.22°C.
- Mean temperature 2015–2024: 13.37°C
- Mean temperature 1991–2020: 12.65°C
- Mean temperature 1961–1990: 11.96°C
Climate Trends
How has Portland's temperature changed over time?
Portland's trend shows an increase of approximately 1.13°C since 1980, with a rate of 0.262°C per decade.
Context
The national average temperature for the top 500 cities from 1991 to 2020 was 14.93°C, indicating that Portland's climate is slightly cooler by 0.05°C compared to Paris.
Climate Impacts
- Increased risk of heat waves.
- Potential for more intense drought conditions.
- Shifts in local ecosystems and wildlife patterns.
Temperature Records
The warmest year on record for Portland was 2015, with a temperature of 14.08°C. The coldest recorded temperature was in 1964 at 10.03°C.
| Year | Temperature (°C) |
|---|---|
| 2015 | 14.08 |
| 2025 | 13.81 |
| 2024 | 13.75 |
| 2023 | 13.66 |
| 2016 | 13.64 |