Average Weather in May in Gregory South Dakota, United States
Daily high temperatures increase by 9°F, from 65°F to 75°F, rarely falling below 51°F or exceeding 86°F.
Daily low temperatures increase by 11°F, from 43°F to 53°F, rarely falling below 32°F or exceeding 62°F.
For reference, on July 19, the hottest day of the year, temperatures in Gregory typically range from 64°F to 88°F, while on January 2, the coldest day of the year, they range from 14°F to 32°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in Gregory experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 47% to 42%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 58% of the time.
For reference, on March 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover Categories in May
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 Gregory, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 27% and ending it at 38%.
For reference, the year's highest daily chance of a wet day is 41% on June 7, and its lowest chance is 3% on January 15.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Gregory is increasing, starting the month at 2.6 inches, when it rarely exceeds 4.6 inches or falls below 0.8 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.7 inches or falls below 1.4 inches.
Average Monthly Rainfall in May
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 May in Gregory is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in May
Over the course of May in Gregory, 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, 0 minutes, implying an average daily increase of 2 minutes, 1 second, and weekly increase of 14 minutes, 7 seconds.
The shortest day of the month is May 1, with 14 hours, 9 minutes of daylight and the longest day is May 31, with 15 hours, 10 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Gregory is 6:30 AM on May 1 and the earliest sunrise is 30 minutes earlier at 6:00 AM on May 31.
The earliest sunset is 8:39 PM on May 1 and the latest sunset is 31 minutes later at 9:10 PM on May 31.
Daylight saving time is observed in Gregory during 2021, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:57 AM and sets 15 hours, 24 minutes later, at 9:21 PM, while on December 21, the shortest day of the year, it rises at 8:06 AM and sets 8 hours, 59 minutes later, at 5:05 PM.
Sunrise & Sunset with Twilight in May
The figure below presents a compact representation of key lunar data for May 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 May
The chance that a given day will be muggy in Gregory is essentially constant during May, remaining within 1% of 1% throughout.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 23% 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 May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Gregory is gradually decreasing during May, decreasing from 12.1 miles per hour to 11.2 miles per hour over the course of the month.
For reference, on April 8, the windiest day of the year, the daily average wind speed is 12.7 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 9.5 miles per hour.
Average Wind Speed in May
The wind direction in Gregory during May is predominantly out of the north from May 1 to May 6 and the south from May 6 to May 31.
Wind Direction in May
The growing season in Gregory typically lasts for 5.3 months (162 days), from around May 1 to around October 10, rarely starting before April 12 or after May 21, and rarely ending before September 21 or after October 30.
During May in Gregory, the chance that a given day is within the growing season is rapidly increasing rising from 50% to 98% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in Gregory are increasing during May, increasing by 290°F, from 181°F to 471°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Gregory is gradually increasing during May, rising by 0.7 kWh, from 6.1 kWh to 6.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Gregory are 43.232 deg latitude, -99.430 deg longitude, and 2,165 ft elevation.
The topography within 2 miles of Gregory contains only modest variations in elevation, with a maximum elevation change of 187 feet and an average elevation above sea level of 2,176 feet. Within 10 miles contains only modest variations in elevation (669 feet). Within 50 miles contains significant variations in elevation (1,506 feet).
The area within 2 miles of Gregory is covered by grassland (75%) and cropland (25%), within 10 miles by grassland (82%) and cropland (18%), and within 50 miles by grassland (73%) and cropland (23%).
This report illustrates the typical weather in Gregory, 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 Gregory.
For each station, the records are corrected for the elevation difference between that station and Gregory 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 Gregory is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Gregory and a given station.
The stations contributing to this reconstruction are: Winner Regional Airport (50%, 38 kilometers, northwest); Chamberlain, Chamberlain Municipal Airport (24%, 60 kilometers, north); Ainsworth Municipal Airport (14%, 87 kilometers, southwest); and The O'Neill Municipal Airport (11%, 104 kilometers, southeast).
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.
Time zones for airports and weather stations are provided by AskGeo.com .