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The Four Seasons Spring • the sun shines more • baby animal • plants and trees wake up • spring showers Summer • Long, hot days. • fruit and vegetables • bees and butterflies fly flower to flower. Fall • leaves • rain • animals get ready for winter Winter • winter is cold • People dress warmly • animals Weather Temperature • •°F (Fahrenheit) •°C (Celsius) Relative Humidity • The relative humidity tells us how “full” the air is at the time of measurement. • For example, 90% relative humidity means that at that moment the air is holding 90% of the maximum amount of water it could. Cloud Cover Symbols High and Low Pressure Areas • High pressure causes air to sink • Usually results in several days of clear sunny skies • Air rises in low pressure areas and forms water droplets • Usually results in rain and storms Air Masses There are two types of air masses: 1. Continental Polar air masses 2. Maritime Tropical air masses Fronts A front is the boundary separating air masses of different densities Fronts extend both vertically and horizontally in the atmosphere