Weather and Climate Archives - Free ZIMSEC & Cambridge Revision Notes

Pressure systems

By garikaib|2025-02-12T09:10:04+02:00February 12th, 2025|O Level Geography, Weather and Climate|

The world's pressure belts The world’s pressure belts and winds ZIMSEC O Level Geography Notes: Pressure

Pressure

Air has weight and therefore exerts pressure, called atmospheric pressure onto the earth’s surface.
The pressure is not the same for all regions nor is it the same for any one region all the time that […]

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Convectional rainfall

By garikaib|2025-02-12T09:32:25+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall

This is the main type of rainfall in the humid tropics such as the Amazon and Congo rain forests.
Occurs when the ground surface is locally […]

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Introduction to weather and climate

By garikaib|2025-02-12T08:59:57+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Rainy Weather. Image by Sodahead. ZIMSEC O Level Geography Notes: Introduction to Weather and Climate

Weather-the state of the atmosphere at a particular place and time as regards heat, cloudiness, dryness, sunshine, wind, rain, etc. The weather is all around us, all the time. It is an […]

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Convergence/Cyclonic/Frontal/Depression rainfall

By garikaib|2025-02-12T09:32:56+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Zimbabwe receives most of its rainfall from the ITCZ. Image by Aljezeera. ZIMSEC O Level Geography Notes: Frontal/ Cyclonic/Convergence Rainfall

This is also know as frontal or cyclonic or depression rainfall.
Cyclonic rainfall occurs in the temperate latitudes and is […]

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The Weather Station

By garikaib|2025-02-12T09:04:04+02:00February 12th, 2025|O Level Geography, Weather and Climate|

A typical weather station. Image by Stanbachonline. ZIMSEC O Level Geography Notes: Weather Station

-A weather station is a facility, either on land or sea, with instruments and equipment for measuring atmospheric conditions to provide information for weather forecasts and to study the weather […]

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Prevailing Winds in Southern Africa

By garikaib|2025-02-12T09:22:01+02:00February 12th, 2025|O Level Geography, Weather and Climate|

The Harmattan. Image by Kafkaesqublog ZIMSEC O Level Geography Notes: Prevailing Winds in Southern Africa

The eastern parts of Zimbabwe about 200km from the port of Beira and on average Zimbabwe is about 400km from the Indian Ocean, the closest ocean to the country.
Due to its proximity to the […]

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Temperature

By garikaib|2025-02-12T09:05:32+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Six's thermometer Six’s thermometer ZIMSEC O Level Geography Notes: Temperature

The daily maximum and minimum temperatures are measured using Six’s thermometer (pictured above).
It was invented by James Six a British scientist hence the name Six’s thermometer.
It is also known as the Maximum and Minimum thermometer.
It is housed in a Stevenson’s screen.
Diurnal […]

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The rain-shadow effect

By garikaib|2025-02-12T09:26:09+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Sem-arid conditions in Save Valley are due to the Rain-shadow effect. Image by Youth Delegates ZIMSEC O Level Geography Notes: Rain Shadow Effect

We have already looked at the formation of relief rainfall elsewhere. The […]

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Stevenson’s screen

By garikaib|2025-02-12T09:07:02+02:00February 12th, 2025|O Level Geography, Weather and Climate|

An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign. ZIMSEC O Level Geography Notes: Stevenson Screen

A Stevenson screen is a prominent feature on most weather stations.

It is used to house weather instruments, for example the […]

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Weather symbols/ Synoptic Charts

By garikaib|2025-02-12T09:28:18+02:00February 12th, 2025|O Level Geography, Weather and Climate|

weather-min

ZIMSEC O Level Geography Notes: Weather Symbols and Synoptic Charts

After weather measurements have been taken at weather stations
they are then plotted onto synoptic charts.
These charts make use of special symbols as a form of pre-agreed shorthand that is used to show the weather conditions at a given place at a […]

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February 2025