Average Weather in Port-Gentil Gabon

1. World
2. Gabon
3. Ogooué-Maritime
4. Port-Gentil

In Port-Gentil, the wet season is overcast, the dry season is windy and partly cloudy, and it is warm and oppressive year round. Over the course of the year, the temperature typically varies from 73°F to 86°F and is rarely below 70°F or above 89°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

In Port-Gentil, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Port-Gentil begins around May 29 and lasts for 4.1 months, ending around October 2. On July 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 50% of the time, and overcast or mostly cloudy 50% of the time.

The cloudier part of the year begins around October 2 and lasts for 7.9 months, ending around May 29. On April 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 86% of the time, and clear, mostly clear, or partly cloudy 14% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Port-Gentil varies very significantly throughout the year.

The wetter season lasts 7.7 months, from October 1 to May 22, with a greater than 41% chance of a given day being a wet day. The chance of a wet day peaks at 79% on November 3.

The drier season lasts 4.3 months, from May 22 to October 1. The smallest chance of a wet day is 1% on August 3.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 79% on November 3.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Port-Gentil experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.7 months, from September 2 to June 23, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 11, with an average total accumulation of 11.2 inches.

The rainless period of the year lasts for 2.3 months, from June 23 to September 2. The least rain falls around July 26, with an average total accumulation of 0.1 inches.

The length of the day in Port-Gentil does not vary substantially over the course of the year, staying within 10 minutes of 12 hours throughout. In 2017, the shortest day is June 21, with 12 hours, 5 minutes of daylight; the longest day is December 21, with 12 hours, 10 minutes of daylight.

The earliest sunrise is at 6:04 AM on November 5, and the latest sunrise is 31 minutes later at 6:34 AM on February 13. The earliest sunset is at 6:12 PM on November 1, and the latest sunset is 31 minutes later at 6:43 PM on February 9.

Daylight saving time (DST) is not observed in Port-Gentil during 2017.

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 perceived humidity level in Port-Gentil, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 99% throughout.

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 Port-Gentil experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.1 months, from May 26 to November 29, with average wind speeds of more than 5.0 miles per hour. The windiest day of the year is September 27, with an average hourly wind speed of 5.7 miles per hour.

The calmer time of year lasts for 5.9 months, from November 29 to May 26. The calmest day of the year is April 26, with an average hourly wind speed of 4.4 miles per hour.

The predominant average hourly wind direction in Port-Gentil varies throughout the year.

The wind is most often from the west for 4.0 weeks, from January 1 to January 29, with a peak percentage of 52% on January 12. The wind is most often from the south for 11 months, from January 29 to January 1, with a peak percentage of 87% on June 8.

Port-Gentil 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.7 months, from January 14 to May 5, with an average temperature above 82°F. The day of the year with the warmest water is March 15, with an average temperature of 84°F.

The time of year with cooler water lasts for 2.8 months, from June 17 to September 11, with an average temperature below 77°F. The day of the year with the coolest water is July 22, with an average temperature of 76°F.

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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.3 months, from July 22 to October 1, with an average daily incident shortwave energy per square meter above 4.9 kWh. The brightest day of the year is August 28, with an average of 5.2 kWh.

The darker period of the year lasts for 6.1 months, from November 11 to May 15, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is April 24, with an average of 3.9 kWh.

For the purposes of this report, the geographical coordinates of Port-Gentil are -0.719 deg latitude, 8.782 deg longitude, and 13 ft elevation.

The topography within 2 miles of Port-Gentil is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 13 feet. Within 10 miles is essentially flat (148 feet). Within 50 miles contains only modest variations in elevation (791 feet).

The area within 2 miles of Port-Gentil is covered by artificial surfaces (50%) and water (46%), within 10 miles by water (87%), and within 50 miles by water (88%).

This report illustrates the typical weather in Port-Gentil, 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 is only a single weather station, Libreville Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Port-Gentil.

At a distance of 149 kilometers from Port-Gentil, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Port-Gentil according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

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.