The movie below shows changes in the Northern Hemisphere jet streams over the course of a year. The view is from above the North Pole, with North America located near the bottom. The colors represent wind speeds, in miles per hour, as shown in the legend to the left of the image.

  !   Click the image to play the movie. Examine the sequence to get a general sense of how the jet stream changes location and speed over a year. Use the movie controls to replay the sequence or to step through it one frame at a time.

1. During which months is the jet stream located closest to the North Pole?

2. During which months is the jet stream located closest to the equator?

3. During which months does the jet stream have the highest wind speeds? How fast is the jet stream during these months?

4. During which months does the jet stream have the lowest wind speeds? How fast is the jet stream during these months?