Weather stations are weather instruments that collect data related to the weather and environment. They measure the atmospheric pressure (barometric pressure) which is the air pressure that is all around us. In general, when the pressure falls the weather is going to get bad, when it rises the weather will improve. Some have alarms which you can set for when the temperature drops to below freezing or when it becomes too hot.
Depending on the type of weather station, for example basic to professional complete sets, they use different sensors for measuring weather conditions for:
Frequently used for accurate measurement of current weather conditions for certain areas. The information gathered can be stored and displayed for further studies and analysis/projects. They can be used for various tasks such as monitoring greenhouses and ensure safe environment for pets e.g. reptile tank not too hot or cold. Predict dangerous weather approaching so areas can be evacuated if hurricanes and floods are expected and for planning outside events.