Spring Weather in Brazzaville Congo - Brazzaville

Daily high temperatures are around 87°F, rarely falling below 80°F or exceeding 93°F. The highest daily average high temperature is 88°F on October 20.

Daily low temperatures are around 71°F, rarely falling below 67°F or exceeding 75°F.

For reference, on April 2, the hottest day of the year, temperatures in Brazzaville typically range from 74°F to 90°F, while on July 17, the coldest day of the year, they range from 67°F to 82°F.

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

Santo Domingo, Dominican Republic (6,010 miles away) is the far-away foreign place with temperatures most similar to Brazzaville (view comparison).

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The spring in Brazzaville experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 51% to 79%.

The clearest day of the spring is September 1, with clear, mostly clear, or partly cloudy conditions 49% of the time.

For reference, on December 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on July 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 60%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Brazzaville, the chance of a wet day over the course of the spring is very rapidly increasing, starting the season at 14% and ending it at 81%.

For reference, the year's highest daily chance of a wet day is 87% on November 11, and its lowest chance is 2% on July 1.

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 spring in Brazzaville is very rapidly increasing, starting the season at 0.9 inches, when it rarely exceeds 2.1 inches or falls below 0.2 inches, and ending the season at 8.7 inches, when it rarely exceeds 13.8 inches or falls below 4.5 inches.

The highest average 31-day accumulation is 10.0 inches on November 13.

Over the course of the spring in Brazzaville, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 19 minutes, implying an average daily increase of 13 seconds, and weekly increase of 1 minute, 30 seconds.

The shortest day of the spring is September 1, with 12 hours, 2 minutes of daylight and the longest day is November 30, with 12 hours, 21 minutes of daylight.

The latest sunrise of the spring in Brazzaville is 5:57 AM on September 1 and the earliest sunrise is 24 minutes earlier at 5:33 AM on November 10.

The latest sunset is 5:59 PM on September 1 and the earliest sunset is 10 minutes earlier at 5:50 PM on October 26.

Daylight saving time is not observed in Brazzaville during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:45 AM and sets 12 hours, 22 minutes later, at 6:08 PM, while on June 20, the shortest day of the year, it rises at 6:04 AM and sets 11 hours, 53 minutes later, at 5:56 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 spring 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 in Brazzaville is very rapidly increasing during the spring, rising from 67% to 100% over the course of the season.

For reference, on April 22, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 29, the least muggy day of the year, there are muggy conditions 47% 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 in Brazzaville is rapidly decreasing during the spring, decreasing from 5.7 miles per hour to 3.4 miles per hour over the course of the season.

For reference, on August 12, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on November 30, the calmest day of the year, the daily average wind speed is 3.4 miles per hour.

The lowest daily average wind speed during the spring is 3.4 miles per hour on November 30.

The hourly average wind direction in Brazzaville throughout the spring is predominantly from the west, with a peak proportion of 79% on September 1.

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.

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 in Brazzaville are very rapidly increasing during the spring, increasing by 2,551°F, from 1,532°F to 4,082°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 in Brazzaville is gradually decreasing during the spring, falling by 0.7 kWh, from 5.5 kWh to 4.8 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the spring is 4.7 kWh on October 30.

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%).