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Average Weather in Roseburg Oregon, United States

In Roseburg, 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 87°F and is rarely below 26°F or above 97°F.

The hot season lasts for 2.9 months, from June 23 to September 20, with an average daily high temperature above 79°F. The hottest day of the year is August 4, with an average high of 87°F and low of 57°F.

The cool season lasts for 3.4 months, from November 12 to February 22, with an average daily high temperature below 56°F. The coldest day of the year is January 1, with an average low of 36°F and high of 48°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 in Roseburg12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillycoldcoolcomfortablewarm
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

In Roseburg, 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 Roseburg begins around June 15 and lasts for 3.9 months, ending around October 11. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 85% of the time, and overcast or mostly cloudy 15% of the time.

The cloudier part of the year begins around October 11 and lasts for 8.1 months, ending around June 15. On November 30, 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

Cloud Cover in Roseburgclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 3076%Nov 3076%Aug 315%Aug 315%Jun 1546%Jun 1546%Oct 1146%Oct 1146%overcastmostly cloudypartly cloudymostly clearclear
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 in Roseburg varies very significantly throughout the year.

The wetter season lasts 6.5 months, from October 18 to May 2, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 55% on November 30.

The drier season lasts 5.5 months, from May 2 to October 18. The smallest chance of a wet day is 3% on August 6.

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 54% on November 30.

Daily Chance of Precipitation

Daily Chance of Precipitation in Roseburgwetwetdry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 3055%Nov 3055%Aug 63%Aug 63%Oct 1829%Oct 1829%May 229%May 229%snowrain
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. Roseburg experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from August 27 to July 3, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around December 5, with an average total accumulation of 8.3 inches.

The rainless period of the year lasts for 1.8 months, from July 3 to August 27. The least rain falls around July 31, with an average total accumulation of 0.2 inches.

Average Monthly Rainfall

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.

Sun

The length of the day in Roseburg varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 59 minutes of daylight; the longest day is June 21, with 15 hours, 23 minutes of daylight.

Hours of Daylight and Twilight

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 5:32 AM on June 14, and the latest sunrise is 2 hours, 20 minutes later at 7:52 AM on November 4. The earliest sunset is at 4:37 PM on December 9, and the latest sunset is 4 hours, 20 minutes later at 8:57 PM on June 26.

Daylight saving time (DST) is observed in Roseburg 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 in Roseburg12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 145:32 AMJun 145:32 AM8:57 PMJun 268:57 PMJun 26Dec 94:37 PMDec 94:37 PM7:52 AMNov 47:52 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 in Roseburg, 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 in Roseburg0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 180%Feb 180%Jul 170%Jul 170%humidhumidcomfortablecomfortabledrydry
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 in Roseburg does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 2.2 miles per hour throughout.

Average Wind Speed

Average Wind Speed in Roseburg0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mphJanFebMarAprMayJunJulAugSepOctNovDecDec 152.5 mphDec 152.5 mphMay 212.0 mphMay 212.0 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 in Roseburg varies throughout the year.

The wind is most often from the west for 1.9 weeks, from April 11 to April 24, with a peak percentage of 32% on April 22. The wind is most often from the north for 5.7 months, from April 24 to October 15, with a peak percentage of 75% on July 22. The wind is most often from the south for 5.9 months, from October 15 to April 11, with a peak percentage of 48% on January 1.

Wind Direction

Wind Direction in RoseburgSWNS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
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

Roseburg 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 3.3 months, from June 19 to September 28, with an average temperature above 55°F. The day of the year with the warmest water is August 26, with an average temperature of 57°F.

The time of year with cooler water lasts for 4.2 months, from December 14 to April 20, with an average temperature below 52°F. The day of the year with the coolest water is February 10, with an average temperature of 50°F.

Average Water Temperature

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 2.9 months, from May 30 to August 26, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is July 16, with an average of 7.7 kWh.

The darker period of the year lasts for 3.9 months, from October 27 to February 23, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 26, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy

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 Roseburg are 43.216 deg latitude, -123.342 deg longitude, and 689 ft elevation.

The topography within 2 miles of Roseburg contains very significant variations in elevation, with a maximum elevation change of 1,050 feet and an average elevation above sea level of 649 feet. Within 10 miles contains very significant variations in elevation (2,825 feet). Within 50 miles contains large variations in elevation (6,736 feet).

The area within 2 miles of Roseburg is covered by artificial surfaces (50%), shrubs (21%), and cropland (20%), within 10 miles by cropland (34%) and shrubs (32%), and within 50 miles by trees (66%) and shrubs (26%).

Data Sources

This report illustrates the typical weather in Roseburg, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Roseburg.

For each station, the records are corrected for the elevation difference between that station and Roseburg 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 Roseburg is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Roseburg and a given station.

The stations contributing to this reconstruction are: Roseburg Municipal Airport (99%, 2.7 kilometers, northwest) and Sexton Summit, (1.2%, 69 kilometers, south).

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.