Average Weather in August in Mahnomen Minnesota, United States
Daily high temperatures decrease by 5°F, from 79°F to 75°F, rarely falling below 64°F or exceeding 88°F.
Daily low temperatures decrease by 4°F, from 59°F to 55°F, rarely falling below 45°F or exceeding 67°F.
For reference, on July 24, the hottest day of the year, temperatures in Mahnomen typically range from 60°F to 80°F, while on January 15, the coldest day of the year, they range from 1°F to 17°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, 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 August
The month of August in Mahnomen experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 26% to 33%.
The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 74% of the time.
For reference, on February 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on July 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
Cloud Cover Categories in August
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mahnomen, the chance of a wet day over the course of August is essentially constant, remaining around 29% throughout.
For reference, the year's highest daily chance of a wet day is 39% on June 28, and its lowest chance is 5% on February 9.
Probability of Precipitation in August
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during August in Mahnomen is essentially constant, remaining about 2.4 inches throughout, and rarely exceeding 4.3 inches or falling below 0.9 inches.
Average Monthly Rainfall in August
Over the course of August in Mahnomen, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 31 minutes, implying an average daily decrease of 3 minutes, 2 seconds, and weekly decrease of 21 minutes, 11 seconds.
The shortest day of the month is August 31, with 13 hours, 24 minutes of daylight and the longest day is August 1, with 14 hours, 55 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Mahnomen is 6:02 AM on August 1 and the latest sunrise is 39 minutes later at 6:41 AM on August 31.
The latest sunset is 8:57 PM on August 1 and the earliest sunset is 51 minutes earlier at 8:05 PM on August 31.
Daylight saving time is observed in Mahnomen during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:27 AM and sets 15 hours, 57 minutes later, at 9:24 PM, while on December 21, the shortest day of the year, it rises at 8:08 AM and sets 8 hours, 28 minutes later, at 4:36 PM.
Sunrise & Sunset with Twilight in August
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 chance that a given day will be muggy in Mahnomen is decreasing during August, falling from 15% to 8% over the course of the month.
For reference, on July 18, the muggiest day of the year, there are muggy conditions 19% of the time, while on October 23, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Mahnomen is increasing during August, increasing from 9.4 miles per hour to 10.6 miles per hour over the course of the month.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on July 27, the calmest day of the year, the daily average wind speed is 9.4 miles per hour.
Average Wind Speed in August
Wind Direction in August
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 Mahnomen typically lasts for 4.9 months (148 days), from around May 6 to around October 1, rarely starting before April 18 or after May 23, and rarely ending before September 13 or after October 21.
The month of August in Mahnomen is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
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.
The average accumulated growing degree days in Mahnomen are rapidly increasing during August, increasing by 510°F, from 1,353°F to 1,863°F, over the course of the month.
Growing Degree Days in August
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 in Mahnomen is decreasing during August, falling by 1.3 kWh, from 6.6 kWh to 5.3 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Mahnomen are 47.315 deg latitude, -95.969 deg longitude, and 1,211 ft elevation.
The topography within 2 miles of Mahnomen is essentially flat, with a maximum elevation change of 66 feet and an average elevation above sea level of 1,206 feet. Within 10 miles is essentially flat (423 feet). Within 50 miles contains only modest variations in elevation (1,204 feet).
The area within 2 miles of Mahnomen is covered by cropland (92%), within 10 miles by cropland (93%), and within 50 miles by cropland (68%) and trees (25%).
This report illustrates the typical weather in Mahnomen year round, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Mahnomen.
For each station, the records are corrected for the elevation difference between that station and Mahnomen 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 Mahnomen is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mahnomen and a given station.
The stations contributing to this reconstruction are: Fosston Municipal Airport (42%, 34 kilometers, northeast); Detroit Lakes Airport (21%, 54 kilometers, south); Moorhead Municipal Airport (13%, 75 kilometers, southwest); Crookston Municipal Airport-Kirkwood Field (13%, 76 kilometers, northwest); and Park Rapids Municipal-Konshok Field Airport (11%, 82 kilometers, southeast).
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.