![]() Humidity is how much water vapour is stored in the air and is shown as a percentage if the humidity is 100%, the air is saturated meaning it cannot hold any more water - this occurs when it is foggy and sometimes when it is raining, but usually it rains before the humidity gets this high. Stevenson screens face north, which combined with their colour and slats, give us the best measure of the current temperature, without getting too hot in direct sunlight or being too cool in the shade. This is a white box with slats in it to allow air to flow through the box. ![]() To measure the temperature accurately we keep our thermometer a Stevenson screens. Instead we now use digital thermometers or alcohol thermometers. We used to use thermometers that had mercury in them, but all of these are no longer used as mercury is dangerous if it were to leak out or the thermometer was to break. To measure temperature we use a thermometer, you probably have one of these at home for taking your temperature when you are feeling poorly. Temperature is a measure of how much heat energy something has when measuring the weather we usually want to know the temperature of the air. ![]() To do this we measure all the different parts of the weather and record it, this is called a weather observation. To be able to make the best weather forecasts we need to know, with as much detail and accuracy as possible, what the weather is doing right now. ![]()
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