Fall Weather at Libreville Airport Gabon

Daily high temperatures are around 83°F, rarely falling below 79°F or exceeding 86°F.

Daily low temperatures are around 75°F, rarely falling below 73°F or exceeding 78°F.

For reference, on March 13, the hottest day of the year, temperatures at Libreville Airport typically range from 76°F to 87°F, while on July 25, the coldest day of the year, they range from 73°F to 80°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.

Punta de Burica, Panama (6,377 miles away) and Barrancabermeja, Colombia (5,759 miles) are the far-away foreign places with temperatures most similar to Libreville Airport (view comparison).

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The fall at Libreville Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 63% to 81%. The highest chance of overcast or mostly cloudy conditions is 83% on November 11.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on April 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 87%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 45%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Libreville Airport, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 16% and ending it at 66%.

For reference, the year's highest daily chance of a wet day is 85% on October 31, and its lowest chance is 3% on July 27.

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 Libreville Airport is very rapidly increasing, starting the season at 1.5 inches, when it rarely exceeds 4.0 inches or falls below 0.1 inches, and ending the season at 9.6 inches, when it rarely exceeds 17.1 inches or falls below 3.6 inches.

The highest average 31-day accumulation is 13.8 inches on October 31.

Over the course of the fall at Libreville Airport, the length of the day is essentially constant. The shortest day of the fall is November 14, with 12 hours, 6 minutes of daylight and the longest day is September 1, with 12 hours, 7 minutes of daylight.

The latest sunrise of the fall at Libreville Airport is 6:18 AM on September 1 and the earliest sunrise is 16 minutes earlier at 6:02 AM on November 2.

The latest sunset is 6:25 PM on September 1 and the earliest sunset is 17 minutes earlier at 6:08 PM on November 2.

Daylight saving time is not observed at Libreville Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:19 AM and sets 12 hours, 9 minutes later, at 6:28 PM, while on December 21, the shortest day of the year, it rises at 6:17 AM and sets 12 hours, 6 minutes later, at 6:23 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 2024. 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 Libreville Airport is essentially constant during the fall, remaining around 100% throughout.

For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 14, the least muggy day of the year, there are muggy conditions 99% 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 Libreville Airport is decreasing during the fall, decreasing from 7.9 miles per hour to 6.7 miles per hour over the course of the season.

For reference, on August 17, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on April 30, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.

The hourly average wind direction at Libreville Airport throughout the fall is predominantly from the west, with a peak proportion of 68% on September 28.

Libreville Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Libreville Airport is increasing during the fall, rising by 4°F, from 78°F to 82°F, over the course of the season.

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).

Temperatures at Libreville Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 Libreville Airport are very rapidly increasing during the fall, increasing by 2,599°F, from 7,236°F to 9,835°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 Libreville Airport is decreasing during the fall, falling by 1.1 kWh, from 4.8 kWh to 3.7 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the fall is 3.7 kWh on November 25.

For the purposes of this report, the geographical coordinates of Libreville Airport are 0.459 deg latitude, 9.412 deg longitude, and 33 ft elevation.

The topography within 2 miles of Libreville Airport contains only modest variations in elevation, with a maximum elevation change of 125 feet and an average elevation above sea level of 26 feet. Within 10 miles also contains only modest variations in elevation (390 feet). Within 50 miles contains only modest variations in elevation (1,909 feet).

The area within 2 miles of Libreville Airport is covered by water (35%), artificial surfaces (19%), grassland (17%), and trees (11%), within 10 miles by water (49%) and trees (19%), and within 50 miles by water (67%) and trees (22%).