Weather Instruments

Weather Instruments

The main elements of the weather that are measured are-

  • Temperature
  • Wind (Direction and Speed)
  • Humidity
  • Precipitation
  • Sunshine

Different instruments are used to measure these different elements of the weather. These are-

Thermometer (Used to measure temperature)

Temperature can be measured in Degrees Celsius and also in Fahrenheit. Thermometers have a bulb at the bottom that is full of Mercury or Alcohol. The mercury rises or falls depending on the temperature.

A thermometer with alcohol that rises and falls in the glass tube

A thermometer with alcohol that rises and falls in the glass tube

Stevenson’s Screen

Weather stations record the temperature in the shade, using a Stevenson’s screen. It contains TWO thermometers, one to record the highest temperature and the other to record the lowest. They then take the average.

To record the Average temperature. Add up all the temperatures of each month and divide by the number of months.

To find the Range of temperature. Take the lowest from the highest.

A Stevenson's Screen that measures temperature and humidity

A Stevenson’s Screen that measures temperature and humidity

Wind

Two elements are measured. Wind direction and wind speed.

Wind direction

Wind direction is measured with a Wind Vane.If the arrow is pointing to the north, that means it is a Northerly Wind. Winds get their name from the direction they come from. Prevailing winds are winds that are most common to an area. Ireland’s prevailing winds are the South-Westerlies.

A Wind Vane that shows direction

A Wind Vane that shows direction

Wind Speed

Wind speed is measured using an instrument called an anemometer. The Anemometer has little cups on it that rotate when the wind blows. The faster the wind blows the faster the cups turn.

An Anemometer that calculates wind speed

An Anemometer that calculates wind speed

Rain Gauge

A rain gauge calculates the amount of rain that falls by collecting it in a graduated cylinder. The rain gauge must be left out in the open, above the ground and away from any form of shelter.

A Rain Gauge

A Rain Gauge

and here’s a song to help you remember it all!