Average Weather in Roseau Minnesota, United States
In Roseau, the summers are long, warm, and partly cloudy and the winters are frigid, dry, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from -2°F to 80°F and is rarely below -24°F or above 88°F.
Based on the tourism score, the best time of year to visit Roseau for warm-weather activities is from late June to late August.
The warm season lasts for 4.1 months, from May 16 to September 19, with an average daily high temperature above 67°F. The hottest day of the year is July 24, with an average high of 80°F and low of 58°F.
The cold season lasts for 3.3 months, from November 27 to March 4, with an average daily high temperature below 28°F. The coldest day of the year is January 15, with an average low of -2°F and high of 16°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 Roseau, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Roseau begins around May 13 and lasts for 5.1 months, ending around October 16. On August 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
The cloudier part of the year begins around October 16 and lasts for 6.9 months, ending around May 13. On February 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 70% of the time, and clear, mostly clear, or partly cloudy 30% 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 Roseau varies significantly throughout the year.
The wetter season lasts 4.3 months, from May 7 to September 15, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 41% on June 20.
The drier season lasts 7.7 months, from September 15 to May 7. The smallest chance of a wet day is 5% on January 24.
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 in Roseau changes throughout the year.
Rain alone is the most common for 8.6 months, from March 6 to November 22. The highest chance of a day with rain alone is 41% on June 20.
Snow alone is the most common for 3.4 months, from November 22 to March 6. The highest chance of a day with snow alone is 8% on December 26.
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. Roseau experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.7 months, from March 24 to November 14, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 20, with an average total accumulation of 3.6 inches.
The rainless period of the year lasts for 4.3 months, from November 14 to March 24. The least rain falls around January 16, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Roseau experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 6.0 months, from October 25 to April 25, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 1, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 6.0 months, from April 25 to October 25. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Roseau varies extremely over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 15 minutes of daylight; the longest day is June 21, with 16 hours, 11 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:18 AM on June 16, and the latest sunrise is 2 hours, 58 minutes later at 8:16 AM on December 31. The earliest sunset is at 4:26 PM on December 11, and the latest sunset is 5 hours, 5 minutes later at 9:30 PM on June 25.
Daylight saving time (DST) is observed in Roseau during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Roseau experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.0 months, from June 9 to September 11, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is July 24, with muggy conditions 24% of the time.
The least muggy day of the year is December 7, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Roseau experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.1 months, from December 28 to June 1, with average wind speeds of more than 9.9 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 11.1 miles per hour.
The calmer time of year lasts for 6.8 months, from June 1 to December 28. The calmest day of the year is July 27, with an average hourly wind speed of 8.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Roseau varies throughout the year.
The wind is most often from the north for 3.0 months, from February 11 to May 12, with a peak percentage of 34% on April 11. The wind is most often from the south for 1.7 months, from May 12 to July 2 and for 4.2 months, from July 24 to November 29, with a peak percentage of 37% on August 26. The wind is most often from the west for 3.1 weeks, from July 2 to July 24 and for 2.4 months, from November 29 to February 11, with a peak percentage of 32% on July 22.
Best Time of Year to Visit
To characterize how pleasant the weather is in Roseau throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Roseau for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Roseau for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Roseau typically lasts for 4.4 months (137 days), from around May 11 to around September 24, rarely starting before April 22 or after May 29, and rarely ending before September 8 or after October 12.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Roseau should appear around May 5, only rarely appearing before April 22 or after May 22.
Growing Degree Days
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 3.6 months, from May 1 to August 21, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is July 11, with an average of 6.8 kWh.
The darker period of the year lasts for 3.5 months, from October 27 to February 12, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 19, with an average of 1.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Roseau are 48.846 deg latitude, -95.763 deg longitude, and 1,050 ft elevation.
The topography within 2 miles of Roseau is essentially flat, with a maximum elevation change of 33 feet and an average elevation above sea level of 1,047 feet. Within 10 miles is essentially flat (115 feet). Within 50 miles also contains only modest variations in elevation (472 feet).
The area within 2 miles of Roseau is covered by cropland (79%) and artificial surfaces (20%), within 10 miles by cropland (77%), and within 50 miles by cropland (37%) and trees (35%).
This report illustrates the typical weather in Roseau, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Roseau.
For each station, the records are corrected for the elevation difference between that station and Roseau 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 Roseau is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Roseau and a given station.
The stations contributing to this reconstruction are: Roseau, Roseau Municipal Airport/Rudy Billberg Field (97%, 4.9 kilometers, east); Hallock Municipal Airport (1.3%, 87 kilometers, west); and Thief River Falls Regional Airport (1.2%, 92 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .