Station Overview
Graphical Climatology of Portland, Oregon: Daily Temperatures and Rainfall, by Year (1875 – Present)
The following is a graphical climatology of Portland, Oregon temperatures and precipitation, from 1875 into 2026. Included are summary overview charts followed by 152 year-to-year graphs depicting daily temperatures, temperature anomalies, and precipitation.
Data were accessed from the Utah Climate Center and NCDC Online sites, plus that of the NWS-Portland site.
Explore the Climate Data
Use these shortcuts to move directly to the principal charts, analyses and historical records.
Climate Overview Graphs — RECENT YEARS
- 2026 Daily Temperatures and Precipitation for Portland NewNew (5/31/26)
- 2025 Daily Temperatures and Precipitation for Portland NewNew (12/31/25)
- 2024 Daily Temperatures and Precipitation for Portland
- 2023 Daily Temperatures and Precipitation for PortlandAugust warmest calendar month (mean: 75.4 F) in History
- 2022 Daily Temperatures and Precipitation for Portland
- 2021 Daily Temperatures and Precipitation for Portland
- 2020 Daily Temperatures and Precipitation for Portland
- 2019 Daily Temperatures and Precipitation for Portland
- 2015 Daily Temperatures and Precipitation for PortlandWarmest Year in History (57.4 F)
Portland Misc. Rainfall & Temperature Graphs
- Portland Annual Prcp History (1875-2025) NewNew (1/9/26)
- Portland Annual Mean Temperature History (1875-2025) NewNew (1/9/26)
- Portland Mean and Extreme Daily Max/Min Temps (1875-2020)
- Portland Jul-Jun Total Prcp Histograms
- Boxplot of Portland Individual Calendar Month Precipitation Distributions
- Portland Mean Daily Temperature Range, by Calendar Day
- Portland Annual Coldest Wind Chill Temps New1948-2023 New (9/5/23)
- Portland Annual Warmest Heat Index Temps New1948-2023 New 9/5/23)
Climograms For Portland & Other Charts
- Mean & Extreme Hourly Temps (99% & 1% Percentile Levels), + Stdv's and Skewness Coeff's
- Mean & Extreme Hourly Rel Hum's (1% Percentile Levels)
- Mean Vector Wind Directions, Speeds, and Constancies
- Prevailing 8-Point Compass Wind Directions, Frequencies, and Mean Speeds
- Percent Frequencies of >=.01in, >=.125in, >=.25in, >=.50in, and >=1.00in Precipitation Days (1875-present)
- Mean Scalar Wind Speeds
- Extreme Highest Sustained Winds (99% Percentile Level)
- Cloud Ceilings
- Fog/Haze
- K-Means Clustering Analysis of Portland Diurnal Resultant Wind Patterns
Year-To-Year Graphs – Interpretation
The uppermost chart for a given year’s page (see links below) are “floating-bars” of the year’s daily maxima and minima temperatures. The bars depict the varying diurnal, synoptic, long-wave, seasonal, and sea-surface temperature anomaly influences on Portland temperature over time.
The second chart down shows the day-to-day mean temperature anomalies (daily mean temperature less the corresponding long-term climatological mean). Vertical lines extending upward from the zero line indicate above average means for the day (colored red), those extending downward indicate below average daily means (colored blue).
(Note: Clicking on the floating-bar charts a second time after they appear on the screen will enlarge them even further).
Year-To-Year Graphs — OLDER YEARS
The third chart down shows the second chart’s anomalies in deseasonalized (“standardized”) form. This adjusts for the fact that individual calendar days have higher or lower inherent year-to-year variability in mean temperature. To create a common relative anomaly scale for each day, the anomalies are divided by their corresponding calendar day standard deviations to generate “standardized departures” or “z-scores”. Those scores of plus or minus 3.0 occur just 0.6% of the time; Greatest positive standardized departure in the record is +4.05 z for 29 Jul 2009 , greatest negative –4.74 z for 15 Nov 1955 .
The bottom chart depicts daily precipitation totals, as high as 6.68 inches (13 Dec 1882).
Selected Individual Years' With Interesting Patterns
Year One - Very Cold January and Cold February-March.
Wettest Calendar Year in History (67.24"). December Wettest Calendar Month on Record (20.14").
34.1" Snow in December.
Very Cold over most of January; -2 F on 15th.
35.3" Snow in January.
Coldest Year (50.2 F) until 1964.
Large Daily Temperature Anomalies - RMSE of Standardized Daily Mean Departures (1.22) highest of any year
Second highest RMSE of any year (1.18)
Very warm first half of year; also mildest April - Effect of Strong El Nino of 1926
December 2nd wettest calendar month in history (17.47")
Warmest Year in history up to this time (57.36 F); mildest Spring (Mar-May) - 58.8 F
105 F on 13 July highest temperature recorded to-date.
Five consecutive days with 100 F or higher temps, 13-17 July.
107 F on 2 July, record highest temperature
Driest Calendar Year (23.37") up to this time; 101 F on 5th, latest 100 F + temperature ever recorded.
January Coldest Calendar Month in History (27.0 F); also, -2 F on 31 Jan, -3 F on 2 Feb. January also Snowiest Calendar Month in History (41.4"); 30 consecutive days with measurable snow depth over January and February.
Mildest January in History (47.3 F)
Coolest Summer in History (June-August : 61.5 F)
Coldest Spring in History (March-May : 47.0 F). Spectacular early November temperature plunge and ensuing six-day cold spell.
Coldest Year in History (50.1 F)
107 F on 30 July.
103 F, 107 F, 105 F, and 107 F recorded on 7-10 August
Driest Year in History (22.48") - July warmest Calendar Month in History (74.1 F). Also very cold November & December.
Wettest Calendar Year (63.20") since 1882
Lowest RMSE of any year (.803)
106 F on 28 and 29 July
Warmest September in History (67.6 F); Warmest Fall (Sept-Nov : 58.0 F)
Warmest Year in History (57.4 F) also warmest June & October, and Warmest Summer (June-August : 72.2 F)
Warmest August in History (73.6 F)
Data Collection 07Analytics
Sample Regimes, PCA Modes, PDFs & Extremes+
Rainfall+
Regimes+
Sample analysis: group years by recurring wet-season rainfall patterns for Portland, then compare transitions between common, unusual and persistent regimes. This is sample Analytics content for layout and workflow testing. Replace it with the station’s verified analysis when the final material is ready.
PDFs+
Sample analysis: compare the central distribution and tail behavior of daily rainfall observations at Portland. This is sample Analytics content for layout and workflow testing. Replace it with the station’s verified analysis when the final material is ready.
Temperature+
PCA Modes+
Sample analysis: demonstrate how leading modes can separate broad seasonal temperature variability from shorter-lived anomalies at Portland. This is sample Analytics content for layout and workflow testing. Replace it with the station’s verified analysis when the final material is ready.
Extremes+
Sample analysis: review the upper and lower tails of the temperature record for Portland and identify years that merit detailed chart interpretation. This is sample Analytics content for layout and workflow testing. Replace it with the station’s verified analysis when the final material is ready.
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