Fall Weather in Aozou Chad

Daily high temperatures decrease by 19°F, from 98°F to 78°F, rarely falling below 69°F or exceeding 102°F.

Daily low temperatures decrease by 20°F, from 70°F to 49°F, rarely falling below 42°F or exceeding 74°F.

For reference, on June 5, the hottest day of the year, temperatures in Aozou typically range from 72°F to 101°F, while on January 4, the coldest day of the year, they range from 42°F to 71°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.

Mariental, Namibia (3,215 miles away) is the far-away foreign place with temperatures most similar to Aozou (view comparison).

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The fall in Aozou experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 8% to 28%. The lowest chance of overcast or mostly cloudy conditions is 7% on September 13.

The clearest day of the fall is September 13, with clear, mostly clear, or partly cloudy conditions 93% of the time.

For reference, on December 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 28%, while on June 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 94%.

Over the course of the fall in Aozou, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 39 minutes, implying an average daily decrease of 1 minute, 6 seconds, and weekly decrease of 7 minutes, 40 seconds.

The shortest day of the fall is November 30, with 10 hours, 54 minutes of daylight and the longest day is September 1, with 12 hours, 33 minutes of daylight.

The earliest sunrise of the fall in Aozou is 5:33 AM on September 1 and the latest sunrise is 38 minutes later at 6:11 AM on November 30.

The latest sunset is 6:06 PM on September 1 and the earliest sunset is 1 hour, 0 minutes earlier at 5:06 PM on November 26.

Daylight saving time is not observed in Aozou during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:07 AM and sets 13 hours, 28 minutes later, at 6:36 PM, while on December 21, the shortest day of the year, it rises at 6:24 AM and sets 10 hours, 48 minutes later, at 5:12 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 in Aozou is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 19, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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 in Aozou is rapidly decreasing during the fall, decreasing from 10.2 miles per hour to 7.6 miles per hour over the course of the season.

For reference, on June 27, the windiest day of the year, the daily average wind speed is 10.8 miles per hour, while on December 10, the calmest day of the year, the daily average wind speed is 7.4 miles per hour.

The wind direction in Aozou during the fall is predominantly out of the east from September 1 to October 29 and the north from October 29 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).

While it does not do so every year, freezing temperatures are seen in Aozou over some winters. The day least likely to be in the growing season is January 16, with a 70% chance.

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 Aozou are very rapidly increasing during the fall, increasing by 2,038°F, from 5,638°F to 7,675°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 Aozou is very rapidly decreasing during the fall, falling by 2.4 kWh, from 7.6 kWh to 5.1 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Aozou are 21.837 deg latitude, 17.427 deg longitude, and 3,432 ft elevation.

The topography within 2 miles of Aozou contains very significant variations in elevation, with a maximum elevation change of 958 feet and an average elevation above sea level of 3,322 feet. Within 10 miles contains very significant variations in elevation (2,746 feet). Within 50 miles contains large variations in elevation (5,482 feet).

The area within 2 miles of Aozou is covered by bare soil (93%), within 10 miles by bare soil (98%), and within 50 miles by bare soil (99%).