The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.
A wet day is one with at least 0. To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding day period centered around each day.
The average sliding day rainfall during September in Luanda is essentially constant , remaining about 0. Over the course of September in Luanda, the length of the day is essentially constant. The shortest day of the month is September 1 , with 11 hours, 57 minutes of daylight and the longest day is September 30 , with 12 hours, 10 minutes of daylight. The latest sunrise of the month in Luanda is AM on September 1 and the earliest sunrise is 17 minutes earlier at AM on September For reference, on December 21 , the longest day of the year, the Sun rises at AM and sets 12 hours, 39 minutes later, at PM , while on June 21 , the shortest day of the year, it rises at AM and sets 11 hours, 37 minutes later, at 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 September 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.
