Average Weather in Roseburg Oregon, United States
In Roseburg, the temperature typically varies from 36°F to 87°F over the course of the year, and is rarely below 26°F or above 97°F.
The hot season lasts for 89 days, 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 102 days, 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 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
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 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 237 days, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 118 days, 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 247 days, 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.
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 196 days, 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 169 days, 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
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 in the year. Roseburg experiences very significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 310 days, 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 55 days, from July 3 to August 27. The least rain falls around July 31, with and average total accumulation of 0.2 inches.
Average Monthly Rainfall
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
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
The predominant average hourly wind direction in Roseburg varies throughout the year.
The wind is most often from the west for 13 days, from April 11 to April 24, with a peak percentage of 35% on May 27. The wind is most often from the north for 174 days, from April 24 to October 15, with a peak percentage of 75% on July 22. The wind is most often from the south for 178 days, from October 15 to April 11, with a peak percentage of 49% on November 18.
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 101 days, 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 127 days, 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
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 very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 88 days, 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 119 days, 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
For the purposes of this report, the geographical coordinates of Roseburg are 43.216 deg latitude, -123.342 deg longitude, and 689 ft elevation (map ).
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 large variations in elevation (2,825 feet). Within 50 miles contains extreme 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%).
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.
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 .