Meteorologists use several instruments to measure climate conditions in a particular area. The thermometer is used to measure the temperature, from the highest high to the lowest low, so as to produce a range. A barometer is used to measure the air pressure, again from high to low. An anemometer is used to indicate both wind direction and wind speed. A rain guage is used to collect precipitation, not only rain, but snow, sleet, and even hail. Rain gauges measure precipitation in inches of rainfall per year. A psychrometer is an instrument used to measure the amount of relative humidity in the area. Relative humidity is a comparison of how much water vapor is in the air compared to the maximum amount of water vapor it can hold at a given temperature. All these instruments make various measurements which can then be used to assign the area in question a specific type of climate.
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