Weather Vocabulary Weather The condition of the atmosphere on any given day. The sun and the water cycle create the weather. Clouds A collection of tiny water droplets or ice crystals that float in the air Air Pressure The weight of the atmosphere Measured with a barometer Temperature How hot or cold something is Measured with a thermometer Humidity The amount of moisture or water vapor in the air Measured with a psychrometer Higher humidity ïƒ lower air pressure Wind The movement of air from high pressure to low pressure. Measured with an anemometer CONDENSATION PRECIPITATION EVAPORATION