Average Weather in July in Fort Thompson South Dakota, United States
Daily high temperatures increase by 2°F, from 86°F to 88°F, rarely falling below 76°F or exceeding 99°F. The highest daily average high temperature is 89°F on July 20.
Daily low temperatures are around 64°F, rarely falling below 55°F or exceeding 74°F. The highest daily average low temperature is 65°F on July 21.
For reference, on July 19, the hottest day of the year, temperatures in Fort Thompson typically range from 65°F to 89°F, while on January 2, the coldest day of the year, they range from 12°F to 29°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
The month of July in Fort Thompson experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 26% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 24% on July 25.
The clearest day of the month is July 25, with clear, mostly clear, or partly cloudy conditions 76% of the time.
For reference, on March 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on July 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover Categories in July
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 Fort Thompson, the chance of a wet day over the course of July is gradually decreasing, starting the month at 32% and ending it at 29%.
For reference, the year's highest daily chance of a wet day is 38% on June 7, and its lowest chance is 3% on January 22.
Probability of Precipitation in July
The average sliding 31-day rainfall during July in Fort Thompson is gradually decreasing, starting the month at 2.6 inches, when it rarely exceeds 4.7 inches or falls below 1.0 inches, and ending the month at 2.1 inches, when it rarely exceeds 3.4 inches or falls below 1.0 inches.
Average Monthly Rainfall in July
Over the course of July in Fort Thompson, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 48 minutes, implying an average daily decrease of 1 minute, 37 seconds, and weekly decrease of 11 minutes, 16 seconds.
The shortest day of the month is July 31, with 14 hours, 38 minutes of daylight and the longest day is July 1, with 15 hours, 26 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Fort Thompson is 5:58 AM on July 1 and the latest sunrise is 26 minutes later at 6:25 AM on July 31.
The latest sunset is 9:24 PM on July 1 and the earliest sunset is 22 minutes earlier at 9:02 PM on July 31.
Daylight saving time is observed in Fort Thompson during 2021, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:54 AM and sets 15 hours, 30 minutes later, at 9:24 PM, while on December 21, the shortest day of the year, it rises at 8:09 AM and sets 8 hours, 53 minutes later, at 5:02 PM.
Sunrise & Sunset with Twilight in July
The figure below presents a compact representation of key lunar data for July 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 July
The chance that a given day will be muggy in Fort Thompson is increasing during July, rising from 21% to 28% over the course of the month.
The highest chance of a muggy day during July is 29% on July 25.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 29% 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 July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Fort Thompson is gradually decreasing during July, decreasing from 10.3 miles per hour to 9.6 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 12.5 miles per hour, while on July 26, the calmest day of the year, the daily average wind speed is 9.6 miles per hour.
The lowest daily average wind speed during July is 9.6 miles per hour on July 30.
Average Wind Speed in July
The hourly average wind direction in Fort Thompson throughout July is predominantly from the south, with a peak proportion of 39% on July 31.
Wind Direction in July
The growing season in Fort Thompson typically lasts for 5.4 months (163 days), from around April 28 to around October 8, rarely starting before April 7 or after May 19, and rarely ending before September 20 or after October 27.
The month of July in Fort Thompson is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
The average accumulated growing degree days in Fort Thompson are rapidly increasing during July, increasing by 732°F, from 1,075°F to 1,806°F, over the course of the month.
Growing Degree Days in July
The average daily incident shortwave solar energy in Fort Thompson is essentially constant during July, remaining within 0.3 kWh of 7.1 kWh throughout.
The highest average daily incident shortwave solar energy during July is 7.4 kWh on July 4.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Fort Thompson are 44.069 deg latitude, -99.438 deg longitude, and 1,444 ft elevation.
The topography within 2 miles of Fort Thompson contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 1,447 feet. Within 10 miles contains only modest variations in elevation (656 feet). Within 50 miles contains significant variations in elevation (1,014 feet).
The area within 2 miles of Fort Thompson is covered by grassland (55%), cropland (23%), and water (22%), within 10 miles by grassland (72%) and water (14%), and within 50 miles by grassland (69%) and cropland (28%).
This report illustrates the typical weather in Fort Thompson, 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 Fort Thompson.
For each station, the records are corrected for the elevation difference between that station and Fort Thompson 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 Fort Thompson is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fort Thompson and a given station.
The stations contributing to this reconstruction are: Chamberlain, Chamberlain Municipal Airport (66%, 35 kilometers, south); Pierre Municipal Airport (21%, 76 kilometers, northwest); and Huron Regional Airport (13%, 104 kilometers, east).
Time zones for airports and weather stations are provided by AskGeo.com .