Average Weather in Astoria Oregon, United States
In Astoria, the summers are comfortable and partly cloudy and the winters are chilly, wet, and overcast. Over the course of the year, the temperature typically varies from 38°F to 69°F and is rarely below 29°F or above 77°F.
The warm season lasts for 3.5 months, from June 18 to October 2, with an average daily high temperature above 65°F. The hottest day of the year is August 18, with an average high of 69°F and low of 54°F.
The cool season lasts for 3.1 months, from November 21 to February 23, with an average daily high temperature below 52°F. The coldest day of the year is December 23, with an average low of 38°F and high of 48°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Astoria, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Astoria begins around June 14 and lasts for 3.8 months, ending around October 8. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 78% of the time, and overcast or mostly cloudy 22% of the time.
The cloudier part of the year begins around October 8 and lasts for 8.2 months, ending around June 14. On January 9, the cloudiest day of the year, the sky is overcast or mostly cloudy 75% of the time, and clear, mostly clear, or partly cloudy 25% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Astoria varies very significantly throughout the year.
The wetter season lasts 6.7 months, from October 10 to May 2, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 62% on November 18.
The drier season lasts 5.3 months, from May 2 to October 10. The smallest chance of a wet day is 6% on August 3.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 61% on November 18.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Astoria experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Astoria. The most rain falls during the 31 days centered around November 24, with an average total accumulation of 11.4 inches.
The least rain falls around July 29, with an average total accumulation of 0.5 inches.
Average Monthly Rainfall
The length of the day in Astoria varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 37 minutes of daylight; the longest day is June 20, with 15 hours, 47 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:23 AM on June 15, and the latest sunrise is 2 hours, 38 minutes later at 8:01 AM on November 4. The earliest sunset is at 4:29 PM on December 10, and the latest sunset is 4 hours, 42 minutes later at 9:11 PM on June 25.
Daylight saving time (DST) is observed in Astoria during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 perceived humidity level in Astoria, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
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 in Astoria experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.4 months, from October 22 to April 4, with average wind speeds of more than 3.7 miles per hour. The windiest day of the year is December 4, with an average hourly wind speed of 4.8 miles per hour.
The calmer time of year lasts for 6.6 months, from April 4 to October 22. The calmest day of the year is August 12, with an average hourly wind speed of 2.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Astoria varies throughout the year.
The wind is most often from the west for 2.4 months, from April 14 to June 25, with a peak percentage of 43% on June 8. The wind is most often from the north for 3.5 months, from June 25 to October 9, with a peak percentage of 52% on July 21. The wind is most often from the south for 6.2 months, from October 9 to April 14, with a peak percentage of 39% on January 1.
Astoria is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.5 months, from June 15 to September 30, with an average temperature above 56°F. The day of the year with the warmest water is August 24, with an average temperature of 59°F.
The time of year with cooler water lasts for 4.1 months, from December 7 to April 11, with an average temperature below 50°F. The day of the year with the coolest water is February 10, with an average temperature of 48°F.
Average Water Temperature
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 experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.1 months, from May 22 to August 24, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 16, with an average of 7.0 kWh.
The darker period of the year lasts for 4.0 months, from October 24 to February 23, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 26, with an average of 0.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Astoria are 46.188 deg latitude, -123.831 deg longitude, and 0 ft elevation.
The topography within 2 miles of Astoria contains significant variations in elevation, with a maximum elevation change of 673 feet and an average elevation above sea level of 76 feet. Within 10 miles contains significant variations in elevation (1,467 feet). Within 50 miles contains very significant variations in elevation (3,655 feet).
The area within 2 miles of Astoria is covered by water (54%), herbaceous vegetation (19%), and trees (14%), within 10 miles by water (42%) and trees (33%), and within 50 miles by water (43%) and trees (38%).
This report illustrates the typical weather in Astoria, 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
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Astoria.
For each station, the records are corrected for the elevation difference between that station and Astoria according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Astoria is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Astoria and a given station.
The stations contributing to this reconstruction are: Clatsop County Airport (95%, 5.3 kilometers, southwest); Southwest Washington Regional Airport (1.9%, 73 kilometers, east); Chehalis-Centralia Airport (1.5%, 85 kilometers, northeast); and Bowerman Airport (1.4%, 88 kilometers, north).
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.