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Average Weather at Aurora State Airport Oregon, United States

At Aurora State Airport, the summers are short, warm, dry, and mostly clear and the winters are chilly, wet, and overcast. Over the course of the year, the temperature typically varies from 36°F to 85°F and is rarely below 25°F or above 96°F.

The warm season lasts for 2.8 months, from June 25 to September 18, with an average daily high temperature above 77°F. The hottest day of the year is August 3, with an average high of 85°F and low of 56°F.

The cool season lasts for 3.4 months, from November 12 to February 23, with an average daily high temperature below 54°F. The coldest day of the year is December 30, with an average low of 36°F and high of 46°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature at Aurora State AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcomfortablewarmcoldcoolchilly
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

At Aurora State Airport, 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 at Aurora State Airport begins around June 11 and lasts for 3.9 months, ending around October 8. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 82% of the time, and overcast or mostly cloudy 18% of the time.

The cloudier part of the year begins around October 8 and lasts for 8.1 months, ending around June 11. On January 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 76% of the time, and clear, mostly clear, or partly cloudy 24% of the time.

Cloud Cover Categories

Cloud Cover Categories at Aurora State AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 382%Aug 382%Jan 1624%Jan 1624%Jun 1153%Jun 1153%Oct 853%Oct 853%clearpartly cloudymostly cloudyovercastmostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Aurora State Airport varies very significantly throughout the year.

The wetter season lasts 6.9 months, from October 13 to May 9, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 58% on November 27.

The drier season lasts 5.1 months, from May 9 to October 13. The smallest chance of a wet day is 4% on August 4.

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 57% on November 18.

Daily Chance of Precipitation

Daily Chance of Precipitation at Aurora State AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 2758%Nov 2758%Aug 44%Aug 44%Oct 1332%Oct 1332%May 932%May 932%rainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Aurora State Airport experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from August 16 to July 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around December 1, with an average total accumulation of 9.3 inches.

The rainless period of the year lasts for 1.0 months, from July 16 to August 16. The least rain falls around July 29, with an average total accumulation of 0.3 inches.

Average Monthly Rainfall

Average Monthly Rainfall at Aurora State AirportrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 in12 in14 in16 inDec 19.3 inDec 19.3 inJul 290.3 inJul 290.3 in
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. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Aurora State Airport does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Aurora State AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 inDec 230.2 inDec 230.2 inJul 190.0 inJul 190.0 inFeb 90.1 inFeb 90.1 in
The average liquid-equivalent snowfall (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. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Aurora State Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 44 minutes of daylight; the longest day is June 20, with 15 hours, 39 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Aurora State AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 39 minJun 2015 hr, 39 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 228 hr, 44 minDec 218 hr, 44 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:22 AM on June 15, and the latest sunrise is 2 hours, 32 minutes later at 7:54 AM on November 4. The earliest sunset is at 4:28 PM on December 10, and the latest sunset is 4 hours, 34 minutes later at 9:02 PM on June 26.

Daylight saving time (DST) is observed at Aurora State Airport 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

Sunrise & Sunset with Twilight and Daylight Saving Time at Aurora State AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:22 AMJun 155:22 AM9:02 PMJun 269:02 PMJun 26Dec 104:28 PMDec 104:28 PM7:54 AMNov 47:54 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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 at Aurora State Airport, 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

Humidity Comfort Levels at Aurora State AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 10%Feb 10%Jul 161%Jul 161%drydrycomfortablecomfortablehumidhumid
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Aurora State Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.1 months, from October 28 to March 30, with average wind speeds of more than 2.7 miles per hour. The windiest day of the year is December 3, with an average hourly wind speed of 3.3 miles per hour.

The calmer time of year lasts for 6.9 months, from March 30 to October 28. The calmest day of the year is August 9, with an average hourly wind speed of 2.2 miles per hour.

Average Wind Speed

Average Wind Speed at Aurora State AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mph5.5 mphDec 33.3 mphDec 33.3 mphAug 92.2 mphAug 92.2 mphOct 282.7 mphOct 282.7 mphMar 302.7 mphMar 302.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Aurora State Airport varies throughout the year.

The wind is most often from the west for 2.9 months, from April 15 to July 13 and for 1.7 months, from July 29 to September 19, with a peak percentage of 47% on May 30. The wind is most often from the north for 2.3 weeks, from July 13 to July 29 and for 5.0 days, from September 19 to September 24, with a peak percentage of 46% on July 21. The wind is most often from the south for 6.7 months, from September 24 to April 15, with a peak percentage of 46% on January 1.

Wind Direction

Wind Direction at Aurora State AirportSWNWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%southeastwestnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Aurora State Airport 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 3.4 months, from June 16 to September 27, with an average temperature above 57°F. The day of the year with the warmest water is August 22, with an average temperature of 59°F.

The time of year with cooler water lasts for 4.3 months, from December 9 to April 18, with an average temperature below 51°F. The day of the year with the coolest water is February 13, with an average temperature of 49°F.

Average Water Temperature

Average Water Temperature at Aurora State AirportwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec46°F48°F50°F52°F54°F56°F58°F60°F62°F64°FAug 2259°FAug 2259°F49°FFeb 1349°FFeb 13Jun 1657°FJun 1657°FSep 2757°FSep 2757°FDec 951°FDec 951°FApr 1851°FApr 1851°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 2.8 months, from May 30 to August 25, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 16, with an average of 7.3 kWh.

The darker period of the year lasts for 3.9 months, from October 26 to February 22, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest day of the year is December 26, with an average of 1.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Aurora State AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 167.3 kWhJul 167.3 kWhDec 261.0 kWhDec 261.0 kWhMay 306.1 kWhMay 306.1 kWhAug 256.0 kWhAug 256.0 kWhOct 262.3 kWhOct 262.3 kWhFeb 222.3 kWhFeb 222.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Aurora State Airport are 45.254 deg latitude, -122.764 deg longitude, and 161 ft elevation.

The topography within 2 miles of Aurora State Airport contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 152 feet. Within 10 miles contains only modest variations in elevation (1,227 feet). Within 50 miles contains very significant variations in elevation (5,735 feet).

The area within 2 miles of Aurora State Airport is covered by cropland (70%) and artificial surfaces (30%), within 10 miles by cropland (63%) and artificial surfaces (27%), and within 50 miles by trees (43%) and cropland (26%).

Data Sources

This report illustrates the typical weather at Aurora State Airport, 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

Aurora State 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-Hillsboro Airport, Mc Minnville Municipal Airport, Portland International Airport, Pearson Airpark, McNary Field, Portland–Troutdale Airport, Scappoose Industrial Airpark, and Southwest Washington Regional Airport.

Other Data

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.