weather Archives - Free ZIMSEC & Cambridge Revision Notes

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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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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Humidity

By garikaib|2025-02-12T09:08:25+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Wet and dry bulb thermometer. Image by TradeIndia ZIMSEC O Level Geography Notes: Humidity

-a quantity representing the amount of water vapor in the atmosphere.

It is measured using a hydrometer.
The wet and dry bulb thermometer is also known as a psychrometer.
Weather satellites can […]

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Wind direction and speed

By garikaib|2025-02-12T09:14:35+02:00February 12th, 2025|O Level Geography, Weather and Climate|

A cup anemometer and windvane. Image by Noaa.gov. ZIMSEC O Level Geography Notes: Wind direction and speed.

Wind is the movement of air across the earth’s surface due to differences in pressure between two regions. Air moves from high pressure regions to low […]

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Sunshine

By garikaib|2025-02-12T09:16:02+02:00February 12th, 2025|O Level Geography, Weather and Climate|

A sunshine recorder. Image by Rfuess-Mueller. ZIMSEC O Level Geography Notes: Sunshine

It has a glass sphere surrounded by a metal frame.
On the frame is attached a sensitive card.
The sphere focuses the sun’s rays onto the card.
As the sun moves across the sky it burns […]

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Orographic/Relief Rainfall

By garikaib|2025-02-12T09:31:47+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Aberfoyle Tea Estate in the Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. Aberfoyle Tea Estate in the Honde Valley Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. ZIMSEC O Level Geography Notes: […]

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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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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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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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People and Weather

By garikaib|2025-02-12T09:30:16+02:00February 12th, 2025|Notes, O Level Geography, Weather and Climate|

People and Weather. Image via CNN. ZIMSEC O Level Geography Notes: People and Weather

The earth’s climate and weather conditions have been changing constantly throughout the earth’s Geological Timescale.
This has in turn had an impact on people’s cultures, history and current economical and social […]

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February 2025