1. The Four Seasons

2. Spring the sun shines more baby animal plants and trees wake up spring showers

3. Summer Long, hot days. fruit and vegetables bees and butterflies fly flower to flower.

4. Fall leaves rain animals get ready for winter

5. Winter winter is cold People dress warmly animals

6. Weather

7. Temperature °F (Fahrenheit) °C (Celsius)

8. 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.

9. Cloud Cover Symbols

10. 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

11. Air Masses There are two types of air masses: 1. Continental Polar air masses 2. Maritime Tropical air masses

12. Fronts A front is the boundary separating air masses of different densities Fronts extend both vertically and horizontally in the atmosphere