Average Weather in October in Atlanta Georgia, United States
In Atlanta, the month of October is characterized by falling daily high temperatures, with daily highs decreasing by 9°F, from 77°F to 68°F over the course of the month, and rarely exceeding 85°F or dropping below 57°F.
Daily low temperatures decrease by 11°F, from 59°F to 48°F, rarely falling below 37°F or exceeding 68°F.
For reference, on July 22, the hottest day of the year, temperatures in Atlanta typically range from 72°F to 89°F, while on January 23, the coldest day of the year, they range from 35°F to 53°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 Atlanta experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 33% on October 15.
The clearest day of the month is October 15, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on October 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Atlanta, the chance of a wet day over the course of October is gradually decreasing, starting the month at 23% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 45% on July 9, and its lowest chance is 19% on October 29.
Probability of Precipitation in October
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 October in Atlanta is gradually decreasing, starting the month at 3.3 inches, when it rarely exceeds 6.6 inches or falls below 0.9 inches, and ending the month at 3.0 inches, when it rarely exceeds 6.0 inches or falls below 0.6 inches.
The lowest average 31-day accumulation is 2.9 inches on October 23.
Average Monthly Rainfall in October
Over the course of October in Atlanta, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 60 minutes, implying an average daily decrease of 1 minute, 59 seconds, and weekly decrease of 13 minutes, 54 seconds.
The shortest day of the month is October 31, with 10 hours, 50 minutes of daylight and the longest day is October 1, with 11 hours, 49 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Atlanta is 7:32 AM on October 1 and the latest sunrise is 24 minutes later at 7:56 AM on October 31.
The latest sunset is 7:21 PM on October 1 and the earliest sunset is 36 minutes earlier at 6:45 PM on October 31.
Daylight saving time is observed in Atlanta during 2017, 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 6:27 AM and sets 14 hours, 24 minutes later, at 8:51 PM, while on December 21, the shortest day of the year, it rises at 7:38 AM and sets 9 hours, 55 minutes later, at 5:33 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
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 Atlanta is rapidly decreasing during October, falling from 20% to 3% over the course of the month.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 86% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in October
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 Atlanta is essentially constant during October, remaining within 0.1 miles per hour of 3.1 miles per hour throughout.
For reference, on March 8, the windiest day of the year, the daily average wind speed is 3.9 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 2.3 miles per hour.
Average Wind Speed in October
Wind Direction in October
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 Atlanta is decreasing during October, falling by 1.1 kWh, from 5.0 kWh to 3.9 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 Atlanta are 33.749 deg latitude, -84.388 deg longitude, and 981 ft elevation.
The topography within 2 miles of Atlanta contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 995 feet. Within 10 miles contains only modest variations in elevation (495 feet). Within 50 miles contains significant variations in elevation (2,014 feet).
The area within 2 miles of Atlanta is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (83%) and trees (13%), and within 50 miles by trees (57%) and artificial surfaces (26%).
This report illustrates the typical weather in Atlanta 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 Atlanta.
For each station, the records are corrected for the elevation difference between that station and Atlanta 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 Atlanta is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Atlanta and a given station.
The stations contributing to this reconstruction are: Fulton County Airport-Brown Field (37%, 13 kilometers, west); Hartsfield-Jackson Atlanta International Airport (34%, 14 kilometers, south); and Dekalb-Peachtree Airport (28%, 16 kilometers, northeast).
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.