Average Weather in April in Custer South Dakota, United States
Daily high temperatures increase by 8°F, from 48°F to 55°F, rarely falling below 31°F or exceeding 71°F.
Daily low temperatures increase by 8°F, from 26°F to 34°F, rarely falling below 15°F or exceeding 45°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 April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Custer experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 50% throughout the month.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 51% 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 Categories in April
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 Custer, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 14% and ending it at 25%.
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.
Over the course of April in Custer, the chance of a day with only rain increases from 5% to 18%, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow decreases from 6% to 3%.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Custer is rapidly increasing, starting the month at 0.4 inches, when it rarely exceeds 0.9 inches or falls below 0.1 inches, and ending the month at 1.6 inches, when it rarely exceeds 2.9 inches or falls below 0.6 inches.
Average Monthly Rainfall in April
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during April in Custer is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.2 inches or falling below -0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.5 inches on April 13.
Average Monthly Liquid-Equivalent Snowfall in April
Over the course of April in Custer, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 23 minutes, implying an average daily increase of 2 minutes, 51 seconds, and weekly increase of 19 minutes, 56 seconds.
The shortest day of the month is April 1, with 12 hours, 46 minutes of daylight and the longest day is April 30, with 14 hours, 8 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Custer is 6:35 AM on April 1 and the earliest sunrise is 48 minutes earlier at 5:47 AM on April 30.
The earliest sunset is 7:21 PM on April 1 and the latest sunset is 35 minutes later at 7:56 PM on April 30.
Daylight saving time is observed in Custer during 2018, but it neither starts nor ends during April, 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 8:39 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 and Daylight Saving Time in April
The chance that a given day will be muggy in Custer is essentially constant during April, 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 least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Custer is essentially constant during April, remaining within 0.2 miles per hour of 9.0 miles per hour throughout.
For reference, on January 17, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.
The highest daily average wind speed during April is 9.2 miles per hour on April 9.
Average Wind Speed in April
Wind Direction in April
The growing season in Custer typically lasts for 3.9 months (119 days), from around May 25 to around September 21, rarely starting before May 7 or after June 11, and rarely ending before September 4 or after October 10.
The month of April in Custer is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually increasing from 0% to 3% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Custer are gradually increasing during April, increasing by 49°F, from 21°F to 70°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Custer is increasing during April, rising by 1.1 kWh, from 5.2 kWh to 6.3 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
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).
Time zones for aiports and weather stations are provided by AskGeo.com .