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These are the main reason for flight cancel


weather conditions:

South Africa's weather from November to February is characterized by the summer season in the Southern Hemisphere. This period is generally hot, sunny, and, for most of the country, is also the rainy season. However, the weather can vary significantly depending on the region due to South Africa's diverse climates

Gauteng (Johannesburg & Pretoria)

​Weather: This is a summer rainfall region. The days are hot and humid, often with clear mornings.

​Rainfall: Expect frequent, but usually brief, afternoon thunderstorms. These can be quite dramatic and provide a welcome cool-down from the heat.

​Temperatures: Average highs around 25-28°C (77-82°F) and lows around 14-17°C (57-63°F).

density altitude: From November to February, Johannesburg experiences a significant increase in density altitude, a critical factor for aviation. This is primarily due to a combination of its high elevation and the hot, humid weather of the summer season


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Impact on Aircraft Performance


​The combination of these factors creates a "hot and high" condition that significantly affects aircraft performance. A higher density altitude means the air is thinner,

causing
​Reduced Engine Performance: The engines produce less power and thrust.

​Reduced Lift: The wings generate less lift, requiring a higher true airspeed to become airborne.

​Longer Takeoff Roll: Due to the reduced power and lift, aircraft require a much longer runway distance to take off.

​Decreased Rate of Climb: The aircraft's ability to climb after takeoff is diminished, which is a major safety consideration, especially when flying over terrain or out of a high-altitude airport.


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winds:

In Johannesburg, the period from September to January marks the transition from late spring into the peak of summer, and this seasonal change has a direct and significant impact on surface winds.
General Wind Patterns
Direction: During these months, the prevailing winds in Johannesburg are typically from the northeast and northwest. This pattern is especially common during the late morning and afternoon.
Speed: Average wind speeds are generally light to moderate, but the frequency and intensity of gusting winds increase significantly as the season progresses. October is often cited as the windiest month of the year in Johannesburg.
Seasonal Breakdown
September: This is the beginning of spring. Winds are generally light, but as the atmosphere warms, the potential for stronger winds increases. It is a transitional period, with clear skies being common, though the chance of thunderstorms begins to rise towards the end of the month.
October & November: As the city heats up, the risk of strong winds increases. The higher temperatures and incoming moisture from the Indian Ocean create an unstable atmosphere, which is a key ingredient for thunderstorms.
December & January: This is the heart of the summer rainy season. The most significant wind events are directly tied to the development of powerful convective thunderstorms.