ClimateObservatory

United States

Temperature trends in Portland

4 weather stations · coverage 1900–2025

Portland · north-americaGoogle Maps · Terms

Primary weather station near Portland with the most complete temperature record

HEADWORKS PORTLAND WATER B

Station record

Station id
USC00353770
Source
NOAA
Record
1900–2025
Years
109
Warmest year
1992 (13.0°C)
Coldest year
1916 (8.99°C)
Trend since 1980
-0.16°C / decade

HEADWORKS PORTLAND WATER B

1900–2025 · Portland, United States

NOAACSVShare on X

First 10 years (1900–1919): 10.07 °C · Last 10 years (2016–2025): 10.96 °C · Gap: +0.89 °C

Annual mean temperatures — NOAA source.

Overview of Climate Trends in Portland

Portland has experienced notable climate changes from 1900 to 2025, with multiple stations in the region contributing to our understanding of these trends. The average temperature has risen significantly, reflecting broader warming patterns.

Portland's average temperature has increased by 0.89°C from 1900–1919 to 2016–2025.

Temperature Data

The mean temperature for the first decade (1900–1919) was 10.07°C, while the last decade (2016–2025) showed an increase to 10.96°C. This represents a warming of 0.89°C.

In comparison to the national benchmark, the average temperature in the top 500 cities from 1991 to 2020 was approximately 15.02°C, indicating that Portland's climate is cooler than many other urban areas.

What are the recent temperature changes in Portland?

From 2016 to 2025, the mean temperature was 10.96°C, slightly higher than the 10.91°C recorded from 2006 to 2015, showing a modest increase of 0.05°C.

Context of Climate Change

Portland's warming reflects a global trend influenced by various factors, including urbanization and greenhouse gas emissions. This warming trend contributes to increased risks of heatwaves and droughts in the region.

Impacts of Warming

  1. Increased frequency of heatwaves.
  2. Potential for drought conditions impacting water supply.
  3. Changes in local ecosystems and wildlife habitats.

Temperature Records

The warmest year on record for Portland was 1992, with a temperature of 13.03°C, while the coldest recorded temperature was 8.99°C in 1916.

Across the full record, the trend indicates that Portland is experiencing a gradual increase in temperatures, aligning with global climate change patterns.

Frequently asked questions

Which weather station is used for Portland?
Statistics on this page come from the HEADWORKS PORTLAND WATER B station, id USC00353770, NOAA source.
How long is the temperature record in Portland?
The record runs from 1900 to 2025 (109 years with data).
How much has Portland warmed?
The annual mean changed by +0.89°C from 1900–1919 to 2016–2025 (first 10 vs last 10 years of the series).
What was the warmest year on record in Portland?
The warmest year in this series is 1992 (annual mean 13.0°C).
What is the decade trend since 1980 in Portland?
The linear trend since 1980 is -0.16°C per decade.

Downloads — primary station

Station: HEADWORKS PORTLAND WATER B (NOAA USC00353770).

Fossil CO₂ emissions (ODIAC) in the grid cell for Portland

1° gridded estimate (fossil carbon surface flux integrated over the calendar year, 2000–2023) for the grid cell that contains the city: the plotted value is a surface emission intensity (gC/m²/yr), comparable across regions, not local air CO₂ concentration (wind and mixing are not represented here).

CO₂ page (ODIAC map, Keeling…)

ODIAC 1°×1° grid cell (centre ≈ 33.5°, -91.5°).

All other weather stations near Portland

Here are the 3 other stations linked to this page near Portland, with data that typically span 1912–2025, depending on the site.