Climate and Average Weather Year Round in Roseau Minnesota, United States

In Roseau, the summers are long, warm, and partly cloudy and the winters are frigid, snowy, mostly cloudy, and windy. 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 month of the year in Roseau is July, with an average high of 79°F and low of 57°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 month of the year in Roseau is January, with an average low of -2°F and high of 16°F.

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.

The clearest month of the year in Roseau is July, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.

The cloudier part of the year begins around October 16 and lasts for 6.9 months, ending around May 13.

The cloudiest month of the year in Roseau is February, during which on average the sky is overcast or mostly cloudy 69% of the time.

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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 month with the most wet days in Roseau is June, with an average of 11.6 days with at least 0.04 inches of precipitation.

The drier season lasts 7.7 months, from September 15 to May 7. The month with the fewest wet days in Roseau is January, with an average of 2.1 days with at least 0.04 inches of precipitation.

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 month with the most days of rain alone in Roseau is June, with an average of 11.6 days.

Snow alone is the most common for 3.4 months, from November 22 to March 6. The month with the most days of snow alone in Roseau is December, with an average of 2.0 days.

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. 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 month with the most rain in Roseau is June, with an average rainfall of 3.6 inches.

The rainless period of the year lasts for 4.3 months, from November 14 to March 24. The month with the least rain in Roseau is January, with an average rainfall of 0.0 inches.

Snowfall

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 snowfall.

The snowy period of the year lasts for 6.0 months, from October 25 to April 25, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Roseau is December, with an average snowfall of 2.7 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 accumulation of 0.0 inches.

The length of the day in Roseau varies extremely over the course of the year. In 2026, 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.

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 2026, starting in the spring on March 8, lasting 7.8 months, and ending in the fall on November 1.

The figure below presents a compact representation of key lunar data for 2026. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

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.

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 month with the most muggy days in Roseau is July, with 7.0 days that are muggy or worse.

The least muggy day of the year is February 15, when muggy conditions are essentially unheard of.

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 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 month of the year in Roseau is April, with an average hourly wind speed of 11.0 miles per hour.

The calmer time of year lasts for 6.8 months, from June 1 to December 28. The calmest month of the year in Roseau is July, with an average hourly wind speed of 9.0 miles per hour.

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.

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.

Methodology

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.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

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.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Roseau should appear around May 4, only rarely appearing before April 21 or after May 21.

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 3.6 months, from May 1 to August 21, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest month of the year in Roseau is July, with an average of 6.7 kWh.

The darker period of the year lasts for 3.5 months, from October 26 to February 12, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest month of the year in Roseau is December, with an average of 1.1 kWh.

For the purposes of this report, the geographical coordinates of Roseau are 48.846 deg latitude, -95.763 deg longitude, and 1,047 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%).