Average Weather in October in Selby South Dakota, United States
Daily high temperatures decrease by 16°F, from 66°F to 50°F, rarely falling below 33°F or exceeding 79°F.
Daily low temperatures decrease by 12°F, from 43°F to 31°F, rarely falling below 20°F or exceeding 53°F.
For reference, on July 24, the hottest day of the year, temperatures in Selby typically range from 62°F to 85°F, while on January 3, the coldest day of the year, they range from 7°F to 24°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
The month of October in Selby experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 40% to 48%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on January 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, 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 October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Selby, the chance of a wet day over the course of October is rapidly decreasing, starting the month at 16% and ending it at 9%.
For reference, the year's highest daily chance of a wet day is 39% on June 6, and its lowest chance is 3% on January 25.
Over the course of October in Selby, the chance of a day with only rain decreases from 16% to 7%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in October
The average sliding 31-day rainfall during October in Selby is decreasing, starting the month at 1.4 inches, when it rarely exceeds 3.4 inches or falls below 0.2 inches, and ending the month at 0.7 inches, when it rarely exceeds 1.8 inches.
Average Monthly Rainfall in October
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 October in Selby is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.3 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in October
Over the course of October in Selby, 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, 32 minutes, implying an average daily decrease of 3 minutes, 3 seconds, and weekly decrease of 21 minutes, 23 seconds.
The shortest day of the month is October 31, with 10 hours, 10 minutes of daylight and the longest day is October 1, with 11 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Selby is 7:38 AM on October 1 and the latest sunrise is 40 minutes later at 8:18 AM on October 31.
The latest sunset is 7:20 PM on October 1 and the earliest sunset is 52 minutes earlier at 6:28 PM on October 31.
Daylight saving time is observed in Selby during 2018, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:51 AM and sets 15 hours, 41 minutes later, at 9:32 PM, while on December 21, the shortest day of the year, it rises at 8:17 AM and sets 8 hours, 42 minutes later, at 4:59 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
The chance that a given day will be muggy in Selby is essentially constant during October, remaining around 0% throughout.
For reference, on July 18, the muggiest day of the year, there are muggy conditions 20% 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 October
The average hourly wind speed in Selby is essentially constant during October, remaining within 0.2 miles per hour of 11.8 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 9.9 miles per hour.
The highest daily average wind speed during October is 12.0 miles per hour on October 19.
Average Wind Speed in October
Wind Direction in October
The growing season in Selby typically lasts for 4.9 months (150 days), from around May 6 to around October 3, rarely starting before April 17 or after May 24, and rarely ending before September 15 or after October 21.
During October in Selby, the chance that a given day is within the growing season is very rapidly decreasing falling from 56% to 2% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
The average accumulated growing degree days in Selby are gradually increasing during October, increasing by 101°F, from 2,455°F to 2,556°F, over the course of the month.
Growing Degree Days in October
The average daily incident shortwave solar energy in Selby is rapidly decreasing during October, falling by 1.5 kWh, from 4.1 kWh to 2.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Selby are 45.506 deg latitude, -100.032 deg longitude, and 1,886 ft elevation.
The topography within 2 miles of Selby contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 1,889 feet. Within 10 miles contains only modest variations in elevation (538 feet). Within 50 miles contains significant variations in elevation (902 feet).
The area within 2 miles of Selby is covered by cropland (65%) and grassland (35%), within 10 miles by grassland (53%) and cropland (47%), and within 50 miles by grassland (68%) and cropland (29%).
This report illustrates the typical weather in Selby 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Selby.
For each station, the records are corrected for the elevation difference between that station and Selby 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 Selby is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Selby and a given station.
The stations contributing to this reconstruction are: Mobridge Municipal Airport (69%, 30 kilometers, west); Ashley Municipal Airport (16%, 81 kilometers, north); Aberdeen Regional Airport (8%, 127 kilometers, east); and Pierre Municipal Airport (8%, 127 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .