Average Weather in January at Portland–Troutdale Airport Oregon, United States
Daily high temperatures increase by 4°F, from 44°F to 48°F, rarely falling below 34°F or exceeding 55°F.
Daily low temperatures are around 37°F, rarely falling below 26°F or exceeding 45°F.
For reference, on August 3, the hottest day of the year, temperatures at Portland–Troutdale Airport typically range from 58°F to 84°F, while on December 30, the coldest day of the year, they range from 36°F to 44°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January at Portland–Troutdale Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 75% throughout the month.
The clearest day of the month is January 30, with clear, mostly clear, or partly cloudy conditions 27% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Portland–Troutdale Airport, the chance of a wet day over the course of January is rapidly decreasing, starting the month at 53% and ending it at 47%.
For reference, the year's highest daily chance of a wet day is 59% on November 27, and its lowest chance is 5% on August 4.
Over the course of January at Portland–Troutdale Airport, the chance of a day with only rain decreases from 48% to 44%, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during January at Portland–Troutdale Airport is decreasing, starting the month at 7.9 inches, when it rarely exceeds 12.7 inches or falls below 3.2 inches, and ending the month at 6.9 inches, when it rarely exceeds 11.6 inches or falls below 2.4 inches.
Average Monthly Rainfall in January
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January at Portland–Troutdale Airport is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.8 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.4 inches on January 6.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January at Portland–Troutdale Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 56 minutes, implying an average daily increase of 1 minute, 52 seconds, and weekly increase of 13 minutes, 6 seconds.
The shortest day of the month is January 1, with 8 hours, 47 minutes of daylight and the longest day is January 31, with 9 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month at Portland–Troutdale Airport is 7:49 AM on January 1 and the earliest sunrise is 18 minutes earlier at 7:31 AM on January 31.
The earliest sunset is 4:36 PM on January 1 and the latest sunset is 38 minutes later at 5:14 PM on January 31.
Daylight saving time is observed at Portland–Troutdale Airport during 2018, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:20 AM and sets 15 hours, 42 minutes later, at 9:02 PM, while on December 21, the shortest day of the year, it rises at 7:46 AM and sets 8 hours, 42 minutes later, at 4:28 PM.
Sunrise & Sunset with Twilight in January
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy at Portland–Troutdale Airport is essentially constant during January, remaining around 0% throughout.
For reference, on August 5, the muggiest day of the year, there are muggy conditions 2% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed at Portland–Troutdale Airport is essentially constant during January, remaining within 0.1 miles per hour of 6.1 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.
Average Wind Speed in January
Wind Direction in January
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season at Portland–Troutdale Airport typically lasts for 8.3 months (253 days), from around March 12 to around November 21, rarely starting before February 14 or after April 12, and rarely ending before October 25 or after December 18.
The month of January at Portland–Troutdale Airport is very likely fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of -0% on January 19.
Time Spent in Various Temperature Bands and the Growing Season in January
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days at Portland–Troutdale Airport are essentially constant during January, remaining within 4°F of 4°F throughout.
Growing Degree Days in January
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy at Portland–Troutdale Airport is gradually increasing during January, rising by 0.6 kWh, from 1.0 kWh to 1.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Portland–Troutdale Airport are 45.549 deg latitude, -122.398 deg longitude, and 43 ft elevation.
The topography within 2 miles of Portland–Troutdale Airport contains significant variations in elevation, with a maximum elevation change of 620 feet and an average elevation above sea level of 88 feet. Within 10 miles contains significant variations in elevation (1,939 feet). Within 50 miles contains very significant variations in elevation (11,155 feet).
The area within 2 miles of Portland–Troutdale Airport is covered by artificial surfaces (49%), herbaceous vegetation (30%), and water (12%), within 10 miles by artificial surfaces (36%) and cropland (25%), and within 50 miles by trees (51%) and shrubs (21%).
This report illustrates the typical weather at Portland–Troutdale Airport year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
Portland–Troutdale Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Portland International Airport, Pearson Airpark, Aurora State Airport, Scappoose Industrial Airpark, Portland-Hillsboro Airport, Southwest Washington Regional Airport, Mc Minnville Municipal Airport, and McNary Field.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.