Climate and Average Weather Year Round in Brazzaville Congo - Brazzaville
In Brazzaville, the wet season is hot, oppressive, and overcast and the dry season is warm, muggy, and partly cloudy. Over the course of the year, the temperature typically varies from 67°F to 90°F and is rarely below 64°F or above 94°F.
Based on the beach/pool score, the best time of year to visit Brazzaville for hot-weather activities is from early June to mid September.
Climate in Brazzaville
The hot season lasts for 3.3 months, from February 3 to May 13, with an average daily high temperature above 88°F. The hottest month of the year in Brazzaville is March, with an average high of 90°F and low of 73°F.
The cool season lasts for 1.8 months, from June 16 to August 10, with an average daily high temperature below 83°F. The coldest month of the year in Brazzaville is July, with an average low of 67°F and high of 82°F.
Average High and Low Temperature in Brazzaville
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.
Average Hourly Temperature in Brazzaville
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Brazzaville, 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 Brazzaville begins around May 25 and lasts for 4.0 months, ending around September 23.
The clearest month of the year in Brazzaville is July, during which on average the sky is clear, mostly clear, or partly cloudy 59% of the time.
The cloudier part of the year begins around September 23 and lasts for 8.0 months, ending around May 25.
The cloudiest month of the year in Brazzaville is December, during which on average the sky is overcast or mostly cloudy 79% of the time.
Cloud Cover Categories in Brazzaville
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Brazzaville varies very significantly throughout the year.
The wetter season lasts 7.9 months, from September 27 to May 23, with a greater than 44% chance of a given day being a wet day. The month with the most wet days in Brazzaville is November, with an average of 25.4 days with at least 0.04 inches of precipitation.
The drier season lasts 4.1 months, from May 23 to September 27. The month with the fewest wet days in Brazzaville is July, with an average of 0.7 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Brazzaville is November, with an average of 25.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 87% on November 12.
Daily Chance of Precipitation in Brazzaville
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. Brazzaville experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 10.0 months, from August 22 to June 21, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Brazzaville is November, with an average rainfall of 10.0 inches.
The rainless period of the year lasts for 2.0 months, from June 21 to August 22. The month with the least rain in Brazzaville is July, with an average rainfall of 0.1 inches.
Average Monthly Rainfall in Brazzaville
The length of the day in Brazzaville does not vary substantially over the course of the year, staying within 22 minutes of 12 hours throughout. In 2022, the shortest day is June 21, with 11 hours, 53 minutes of daylight; the longest day is December 21, with 12 hours, 22 minutes of daylight.
Hours of Daylight and Twilight in Brazzaville
The earliest sunrise is at 5:33 AM on November 11, and the latest sunrise is 34 minutes later at 6:08 AM on July 19. The earliest sunset is at 5:50 PM on October 26, and the latest sunset is 31 minutes later at 6:21 PM on February 3.
Daylight saving time (DST) is not observed in Brazzaville during 2022.
Sunrise & Sunset with Twilight in Brazzaville
The figure below presents a compact representation of key lunar data for 2022. 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.
Moon Rise, Set & Phases in Brazzaville
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.
Brazzaville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 11 months, from August 26 to July 12, during which time the comfort level is muggy, oppressive, or miserable at least 60% of the time. The month with the most muggy days in Brazzaville is December, with 31.0 days that are muggy or worse.
The month with the fewest muggy days in Brazzaville is August, with 16.7 days that are muggy or worse.
Humidity Comfort Levels in Brazzaville
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Brazzaville experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.1 months, from June 22 to September 26, with average wind speeds of more than 4.7 miles per hour. The windiest month of the year in Brazzaville is August, with an average hourly wind speed of 5.9 miles per hour.
The calmer time of year lasts for 8.9 months, from September 26 to June 22. The calmest month of the year in Brazzaville is December, with an average hourly wind speed of 3.5 miles per hour.
Average Wind Speed in Brazzaville
The predominant average hourly wind direction in Brazzaville varies throughout the year.
The wind is most often from the south for 3.0 days, from April 18 to April 21 and for 3.7 weeks, from May 19 to June 14, with a peak percentage of 42% on June 13. The wind is most often from the east for 4.0 weeks, from April 21 to May 19, with a peak percentage of 39% on May 10. The wind is most often from the west for 10 months, from June 14 to April 18, with a peak percentage of 51% on January 1.
Wind Direction in Brazzaville
To characterize how pleasant the weather is in Brazzaville throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Brazzaville for general outdoor tourist activities is from mid June to mid August, with a peak score in the second week of July.
Tourism Score in Brazzaville
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Brazzaville for hot-weather activities is from early June to mid September, with a peak score in the last week of June.
Beach/Pool Score in Brazzaville
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 in Brazzaville 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.
Time Spent in Various Temperature Bands and the Growing Season in Brazzaville
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
Growing Degree Days in Brazzaville
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 per square meter does not vary significantly over the course of the year, remaining within 0.4 kilowatt-hours of 5.1 kilowatt-hours throughout.
Average Daily Incident Shortwave Solar Energy in Brazzaville
For the purposes of this report, the geographical coordinates of Brazzaville are -4.266 deg latitude, 15.283 deg longitude, and 932 ft elevation.
The topography within 2 miles of Brazzaville contains only modest variations in elevation, with a maximum elevation change of 266 feet and an average elevation above sea level of 928 feet. Within 10 miles contains only modest variations in elevation (1,070 feet). Within 50 miles also contains very significant variations in elevation (1,903 feet).
The area within 2 miles of Brazzaville is covered by artificial surfaces (72%) and water (28%), within 10 miles by shrubs (35%) and water (18%), and within 50 miles by shrubs (43%) and trees (36%).
This report illustrates the typical weather in Brazzaville, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Brazzaville.
For each station, the records are corrected for the elevation difference between that station and Brazzaville 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 Brazzaville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Brazzaville and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Brazzaville and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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