Average Weather in August in Bozeman Montana, United States
Daily high temperatures decrease by 6°F, from 84°F to 78°F, rarely falling below 65°F or exceeding 92°F.
Daily low temperatures decrease by 5°F, from 50°F to 45°F, rarely falling below 37°F or exceeding 57°F.
For reference, on July 27, the hottest day of the year, temperatures in Bozeman typically range from 51°F to 84°F, while on December 30, the coldest day of the year, they range from 12°F to 30°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 Bozeman experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 23% to 30%.
The clearest day of the month is August 2, with clear, mostly clear, or partly cloudy conditions 77% of the time.
For reference, on March 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on July 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
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 Bozeman, the chance of a wet day over the course of August is essentially constant, remaining around 19% throughout.
For reference, the year's highest daily chance of a wet day is 39% on June 2, and its lowest chance is 11% on January 27.
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 Bozeman is essentially constant, remaining about 0.9 inches throughout, and rarely exceeding 2.0 inches or falling below 0.2 inches.
The lowest average 31-day accumulation is 0.9 inches on August 10.
Average Monthly Rainfall in August
Over the course of August in Bozeman, 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, 25 minutes, implying an average daily decrease of 2 minutes, 51 seconds, and weekly decrease of 19 minutes, 55 seconds.
The shortest day of the month is August 31, with 13 hours, 20 minutes of daylight and the longest day is August 1, with 14 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Bozeman is 6:07 AM on August 1 and the latest sunrise is 37 minutes later at 6:44 AM on August 31.
The latest sunset is 8:52 PM on August 1 and the earliest sunset is 49 minutes earlier at 8:03 PM on August 31.
Daylight saving time is observed in Bozeman 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 5:34 AM and sets 15 hours, 43 minutes later, at 9:17 PM, while on December 21, the shortest day of the year, it rises at 8:01 AM and sets 8 hours, 41 minutes later, at 4:42 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Bozeman is essentially constant during August, remaining around 0% throughout.
For reference, on June 30, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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
The average hourly wind speed in Bozeman is essentially constant during August, remaining within 0.2 miles per hour of 5.3 miles per hour throughout.
For reference, on January 10, the windiest day of the year, the daily average wind speed is 8.9 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.
The lowest daily average wind speed during August is 5.1 miles per hour on August 5.
Average Wind Speed in August
Wind Direction in August
The growing season in Bozeman typically lasts for 3.7 months (113 days), from around May 26 to around September 16, rarely starting before May 7 or after June 16, and rarely ending before August 30 or after October 3.
The month of August in Bozeman is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 89% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Bozeman are increasing during August, increasing by 442°F, from 997°F to 1,439°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Bozeman is decreasing during August, falling by 1.3 kWh, from 7.3 kWh to 6.0 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 Bozeman are 45.680 deg latitude, -111.039 deg longitude, and 4,865 ft elevation.
The topography within 2 miles of Bozeman contains significant variations in elevation, with a maximum elevation change of 561 feet and an average elevation above sea level of 4,845 feet. Within 10 miles contains significant variations in elevation (4,728 feet). Within 50 miles also contains extreme variations in elevation (7,388 feet).
The area within 2 miles of Bozeman is covered by artificial surfaces (48%), grassland (19%), cropland (17%), and shrubs (15%), within 10 miles by cropland (30%) and trees (28%), and within 50 miles by grassland (35%) and trees (32%).
This report illustrates the typical weather in Bozeman 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Bozeman.
For each station, the records are corrected for the elevation difference between that station and Bozeman 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 Bozeman is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bozeman and a given station.
The stations contributing to this reconstruction are: Gallatin Field Airport (75%, 15 kilometers, northwest); Mission Field (21%, 47 kilometers, east); and West Yellowstone (3.3%, 135 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .