Average Weather in August in Gettysburg South Dakota, United States
Daily high temperatures decrease by 5°F, from 84°F to 80°F, rarely falling below 68°F or exceeding 94°F.
Daily low temperatures decrease by 5°F, from 61°F to 56°F, rarely falling below 47°F or exceeding 69°F.
For reference, on July 19, the hottest day of the year, temperatures in Gettysburg typically range from 62°F to 85°F, while on January 3, the coldest day of the year, they range from 8°F to 24°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 Gettysburg experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 25% to 29%.
The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 75% of the time.
For reference, on February 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
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 Gettysburg, the chance of a wet day over the course of August is rapidly decreasing, starting the month at 29% and ending it at 23%.
For reference, the year's highest daily chance of a wet day is 38% on June 6, and its lowest chance is 4% on January 30.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Gettysburg is gradually decreasing, starting the month at 2.0 inches, when it rarely exceeds 3.4 inches or falls below 1.0 inches, and ending the month at 1.6 inches, when it rarely exceeds 3.0 inches or falls below 0.6 inches.
Average Monthly Rainfall in August
Over the course of August in Gettysburg, 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, 23 minutes, implying an average daily decrease of 2 minutes, 47 seconds, and weekly decrease of 19 minutes, 27 seconds.
The shortest day of the month is August 31, with 13 hours, 17 minutes of daylight and the longest day is August 1, with 14 hours, 40 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Gettysburg is 6:25 AM on August 1 and the latest sunrise is 35 minutes later at 7:01 AM on August 31.
The latest sunset is 9:05 PM on August 1 and the earliest sunset is 48 minutes earlier at 8:18 PM on August 31.
Daylight saving time is observed in Gettysburg during 2021, 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 5:53 AM and sets 15 hours, 37 minutes later, at 9:30 PM, while on December 21, the shortest day of the year, it rises at 8:15 AM and sets 8 hours, 46 minutes later, at 5:01 PM.
Sunrise & Sunset with Twilight in August
The figure below presents a compact representation of key lunar data for August 2021. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in August
The chance that a given day will be muggy in Gettysburg is decreasing during August, falling from 18% to 8% over the course of the month.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 20% of the time, while on October 27, 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 Gettysburg is gradually increasing during August, increasing from 9.8 miles per hour to 10.7 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 12.7 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 9.8 miles per hour.
Average Wind Speed in August
The hourly average wind direction in Gettysburg throughout August is predominantly from the south, with a peak proportion of 38% on August 22.
Wind Direction in August
The growing season in Gettysburg typically lasts for 4.9 months (148 days), from around May 6 to around October 2, rarely starting before April 18 or after May 24, and rarely ending before September 14 or after October 20.
The month of August in Gettysburg is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Gettysburg are rapidly increasing during August, increasing by 588°F, from 1,500°F to 2,088°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Gettysburg is decreasing during August, falling by 1.2 kWh, from 6.9 kWh to 5.7 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 Gettysburg are 45.012 deg latitude, -99.956 deg longitude, and 2,060 ft elevation.
The topography within 2 miles of Gettysburg contains only modest variations in elevation, with a maximum elevation change of 135 feet and an average elevation above sea level of 2,078 feet. Within 10 miles also contains only modest variations in elevation (427 feet). Within 50 miles contains only modest variations in elevation (1,024 feet).
The area within 2 miles of Gettysburg is covered by cropland (53%) and grassland (47%), within 10 miles by cropland (65%) and grassland (35%), and within 50 miles by grassland (61%) and cropland (35%).
This report illustrates the typical weather in Gettysburg, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Gettysburg.
For each station, the records are corrected for the elevation difference between that station and Gettysburg 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 Gettysburg is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Gettysburg and a given station.
The stations contributing to this reconstruction are: Mobridge Municipal Airport (39%, 69 kilometers, northwest); Pierre Municipal Airport (35%, 75 kilometers, south); Aberdeen Regional Airport (15%, 130 kilometers, east); and Huron Regional Airport (12%, 153 kilometers, southeast).
Time zones for airports and weather stations are provided by AskGeo.com .