portland oregon snowfall historyjoe's original dartmouth menu
The black line is the percentage chance that a given day is within the growing season. The shaded overlays indicate night and civil twilight. In contrast to Portland, nearby Forest Grove was really clobbered by heavy snowfall--- a single 48 hour period (Dec. 9-10) saw 25 inches of snow fall-- dry, light stuff, and then temperatures went sub-zero for four days, as low as 15 below! The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. Average Weather in Portland Oregon, United States. Lower dew points feel drier and higher dew points feel more humid.
The figure below shows you a compact characterization of the entire year of hourly average temperatures.
History of Portland, Oregon. The number of hours during which the Sun is visible (black line).
To characterize how pleasant the weather is in Portland throughout the year, we compute two travel scores.
The thin dotted line is the corresponding average liquid-equivalent snowfall. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end. In the 100 years since, no storm of such magnitude has struck Northwestern Oregon (deep snows, extreme cold, and long duration).
The winters are rainier than the summers in Portland. We assume no responsibility for any decisions made on the basis of the content presented on this site. 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.
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
This section discusses the wide-area hourly average wind vector (speed and direction) at All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, The growing season in Portland typically lasts for This report illustrates the typical weather in Portland, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. For each station, the records are corrected for the elevation difference between that station and Portland according to the The tables below give yearly averages for snowfall at cities, towns and parks in Oregon. The average hourly temperature, color coded into bands. The estimated value at Portland is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Portland and a given station.
In 2020, the shortest day is
Shortwave radiation includes visible light and ultraviolet radiation. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. 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.
Averages are for Portland International Airport, which is 7 miles from Portland. The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. The snowfall totals are annual averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Among wet days, we distinguish between those that experience We report snowfall in liquid-equivalent terms. There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Portland.
Time zones for airports and weather stations are provided by For the purposes of this report, the geographical coordinates of Portland are 45.523 deg latitude, -122.676 deg longitude, and 161 ft elevation. This location is classified as Csb by Köppen and Geiger.
In this report, we use a base of The numbers are for the total amount of snow and for how many days it snows at least 0.1 inches (0.25 centimetres). We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. In Portland, the average percentage of the sky covered by clouds experiences Climate Data. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Portland experiences Detailed Climate of … All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's Names, locations, and time zones of places and some airports come from the Daily Oregon HAM Radio Operators Weather Report; Daily Temps/Precip/Snowfall: Portland ( 1940-2019, csv file) Daily Temps/Precip/Snowfall: Astoria ( 1892-2019, csv file) Daily Tems/Precip/Snowfall: Eugene ( 1892-2019, csv file) Daily Temps/Precip/Snowfall: Salem ( 1892-2019, csv file) More Historical Climate Data; Local Climate Studies.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. 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. The predominant average hourly wind direction in Portland varies throughout the year.
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