Fall Weather at Fairfield County Airport South Carolina, United States

Daily high temperatures decrease by 27°F, from 88°F to 61°F, rarely falling below 50°F or exceeding 94°F.

Daily low temperatures decrease by 27°F, from 69°F to 42°F, rarely falling below 30°F or exceeding 74°F.

For reference, on July 20, the hottest day of the year, temperatures at Fairfield County Airport typically range from 72°F to 92°F, while on January 17, the coldest day of the year, they range from 37°F to 55°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Tepehan, Turkey (6,121 miles away) is the far-away foreign place with temperatures most similar to Fairfield County Airport (view comparison).

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The fall at Fairfield County Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 44%. The lowest chance of overcast or mostly cloudy conditions is 35% on October 15.

The clearest day of the fall is October 15, with clear, mostly clear, or partly cloudy conditions 65% of the time.

For reference, on January 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 51%, while on October 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Fairfield County Airport, the chance of a wet day over the course of the fall is rapidly decreasing, starting the season at 30% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 46% on July 27, and its lowest chance is 18% on October 30.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall at Fairfield County Airport is gradually decreasing, starting the season at 3.4 inches, when it rarely exceeds 6.6 inches or falls below 1.1 inches, and ending the season at 3.0 inches, when it rarely exceeds 5.5 inches or falls below 1.2 inches.

The lowest average 31-day accumulation is 2.6 inches on November 4.

Over the course of the fall at Fairfield County Airport, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 49 minutes, implying an average daily decrease of 1 minute, 53 seconds, and weekly decrease of 13 minutes, 10 seconds.

The shortest day of the fall is November 30, with 10 hours, 3 minutes of daylight and the longest day is September 1, with 12 hours, 52 minutes of daylight.

The latest sunrise of the fall at Fairfield County Airport is 7:44 AM on November 1 and the earliest sunrise is 59 minutes earlier at 6:45 AM on November 2.

The latest sunset is 7:50 PM on September 1 and the earliest sunset is 2 hours, 36 minutes earlier at 5:14 PM on November 30.

Daylight saving time (DST) ends at 1:00 AM on November 2, 2025, shifting sunrise and sunset to be an hour earlier.

For reference, on June 21, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 27 minutes later, at 8:39 PM, while on December 21, the shortest day of the year, it rises at 7:26 AM and sets 9 hours, 52 minutes later, at 5:18 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the fall of 2025. 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.

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 at Fairfield County Airport is very rapidly decreasing during the fall, falling from 70% to 2% over the course of the season.

For reference, on August 5, the muggiest day of the year, there are muggy conditions 86% of the time, while on February 8, the least muggy day of the year, there are muggy conditions 0% of the time.

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 at Fairfield County Airport is gradually increasing during the fall, increasing from 4.3 miles per hour to 5.2 miles per hour over the course of the season.

For reference, on March 8, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.

The wind direction at Fairfield County Airport during the fall is predominantly out of the east from September 1 to September 25 and the north from September 25 to November 30.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Fairfield County Airport typically lasts for 8.2 months (252 days), from around March 16 to around November 23, rarely starting before February 13 or after April 10, and rarely ending before November 4 or after December 16.

During the fall at Fairfield County Airport, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 33% over the course of the season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Fairfield County Airport are very rapidly increasing during the fall, increasing by 1,357°F, from 4,158°F to 5,515°F, over the course of the season.

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 at Fairfield County Airport is very rapidly decreasing during the fall, falling by 2.9 kWh, from 5.7 kWh to 2.8 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Fairfield County Airport are 34.315 deg latitude, -81.111 deg longitude, and 574 ft elevation.

The topography within 2 miles of Fairfield County Airport contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 496 feet. Within 10 miles also contains only modest variations in elevation (463 feet). Within 50 miles contains only modest variations in elevation (748 feet).

The area within 2 miles of Fairfield County Airport is covered by trees (63%) and cropland (32%), within 10 miles by trees (91%), and within 50 miles by trees (67%) and cropland (17%).