Average Weather in June in Custer South Dakota, United States
In Custer, the month of June is characterized by rapidly rising daily high temperatures, with daily highs increasing by 11°F, from 65°F to 76°F over the course of the month, and rarely exceeding 87°F or dropping below 53°F.
Daily low temperatures increase by 8°F, from 44°F to 52°F, rarely falling below 35°F or exceeding 59°F.
For reference, on July 19, the hottest day of the year, temperatures in Custer typically range from 54°F to 79°F, while on December 30, the coldest day of the year, they range from 15°F to 34°F.
Average High and Low Temperature in June
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on June. 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 June
The month of June in Custer experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 44% to 26%.
The clearest day of the month is June 30, with clear, mostly clear, or partly cloudy conditions 74% of the time.
For reference, on March 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on July 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover in June
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Custer, the chance of a wet day over the course of June is very rapidly decreasing, starting the month at 35% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 36% on June 2, and its lowest chance is 2% on January 28.
Probability of Precipitation in June
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 June in Custer is decreasing, starting the month at 2.5 inches, when it rarely exceeds 4.4 inches or falls below 0.9 inches, and ending the month at 1.7 inches, when it rarely exceeds 3.0 inches or falls below 0.6 inches.
Average Monthly Rainfall in June
Over the course of June in Custer, the length of the day is essentially constant. The shortest day of the month is June 1, with 15 hours, 15 minutes of daylight and the longest day is June 20, with 15 hours, 28 minutes of daylight.
Hours of Daylight and Twilight in June
The earliest sunrise of the month in Custer is 5:11 AM on June 15 and the latest sunrise is 4 minutes later at 5:15 AM on June 30.
The earliest sunset is 8:29 PM on June 1 and the latest sunset is 11 minutes later at 8:40 PM on June 26.
Daylight saving time is observed in Custer during 2017, but it neither starts nor ends during June, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:12 AM and sets 15 hours, 28 minutes later, at 8:40 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 8 hours, 55 minutes later, at 4:20 PM.
Sunrise & Sunset with Twilight in June
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 Custer is essentially constant during June, remaining around 0% throughout.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the leasy muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in June
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 Custer is essentially constant during June, remaining within 0.2 miles per hour of 4.1 miles per hour throughout.
For reference, on January 17, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.
Average Wind Speed in June
Wind Direction in June
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 Custer is gradually increasing during June, rising by 0.6 kWh, from 7.1 kWh to 7.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in June
For the purposes of this report, the geographical coordinates of Custer are 43.767 deg latitude, -103.599 deg longitude, and 5,486 ft elevation.
The topography within 2 miles of Custer contains very significant variations in elevation, with a maximum elevation change of 1,001 feet and an average elevation above sea level of 5,459 feet. Within 10 miles contains very significant variations in elevation (2,930 feet). Within 50 miles contains large variations in elevation (4,787 feet).
The area within 2 miles of Custer is covered by shrubs (53%) and trees (39%), within 10 miles by trees (82%) and shrubs (16%), and within 50 miles by grassland (60%) and trees (23%).
This report illustrates the typical weather in Custer 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 Custer.
For each station, the records are corrected for the elevation difference between that station and Custer 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 Custer is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Custer and a given station.
The stations contributing to this reconstruction are: Custer County Airfield (98%, 3.9 kilometers, south); Rapid City Regional Airport (1.0%, 53 kilometers, northeast); and Black Hills Airport (1.0%, 81 kilometers, north).
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.