How Does the Jet Stream Change through the Year?
ES1906  Why the Jet Stream Changes during the Year

The jet stream marks the boundary between cold arctic air to the north and warm tropical air to the south. The jet stream's strength depends on the temperature difference between these two air masses. The jet stream is strongest during the winter, when the temperature difference is greatest. During the summer, when the temperature difference between the air masses is smaller, the winds of the jet stream are weaker.


8. What differences might you expect between the Southern and Northern Hemisphere jet streams?

9. Sketch and label the average position of the summer jet stream. Do the same for the average position of the winter jet stream.


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