If the temperature drops and humidity is high, what might happen?

Fog, dew, or frost might form — when air cools to its dew point, water vapor condenses.

Why does the anemometer spin faster when wind speed increases?

The cups catch more wind force, pushing them around faster — the spin rate is proportional to wind speed.

Pro 🔒~10 min

Weather Measurement

Temperature, wind speed, precipitation, and humidity instruments

How it works

Meteorologists use instruments to measure weather: thermometers measure air temperature; anemometers measure wind speed (spinning cups catch the wind); rain gauges collect and measure precipitation; hygrometers measure humidity (moisture in the air). Weather changes day to day but follows patterns by season. Temperature is measured in Celsius (°C) or Fahrenheit (°F). Wind speed is measured in km/h or mph. Precipitation is measured in millimeters of water collected. By recording weather data over time, you can spot patterns and make predictions.

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Step-by-step

Adjust the weather conditions using sliders and watch each instrument respond.
The thermometer level changes, the anemometer spins faster or slower, the rain gauge fills, and the hygrometer needle moves.
Record readings in the data table.

Frequently asked questions

If the temperature drops and humidity is high, what might happen?: Fog, dew, or frost might form — when air cools to its dew point, water vapor condenses.
Why does the anemometer spin faster when wind speed increases?: The cups catch more wind force, pushing them around faster — the spin rate is proportional to wind speed.