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Lesson 5, Fall Migration.
Weather Conditions During the Fall Monarch Migration |

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Background 
In this data collection exercise, students will learn to keep detailed weather records
during the fall migration. If they are also Observing Fall
Migrants, they will be able to compare weather conditions on days that they do and
do not see monarchs. Having a class record of weather data will provide opportunities for
graphing and data analysis activities, while it advances our understanding of monarch
behavior.
Materials
Compass (to measure wind
direction)
Thermometer (if possible, a
max/min type)
Rain gauge
Daily
Weather Observations Data Sheet (student handout page)
Procedure
- Discuss the importance of long-term weather data with your students. Tell them that
weather records dating back over a hundred years are maintained for many locations
throughout the world, and discuss why this is useful. They will probably mention that
weather records help in predicting the weather. However, biologists can use weather
records to help understand patterns in the natural world. This will be how students will
use the data they collect in this lesson.
- It is best if students actually collect weather data themselves. This can be done at
school, the task assigned to individual students. If students do not collect the weather
data, they can get it from sources such as newspapers, TV, or the Internet.
- Set up a time and location to collect weather data. Wind and cloud cover records should
be taken at the same time each day. Estimate wind speed as strong, breezy, light, or calm.
Cloud cover can be clear, partly cloudy, mostly cloudy, or overcast. If possible, get a
high and low temperature for each day, or else record temperature at the same time each
day. Use a rain gauge placed in a location where it will not be disturbed or affected by
trees, bushes, or roof overhangs.
- Record the data on the data sheet for the entire time that monarchs remain in your area.
You can keep recording weather data throughout the year if desired.
- Have students analyze their weather data in some way. For example, they can graph
temperature to show how many days were sunny, cloudy and rainy.

- There are many ways to relate weather conditions to monarchs. If your class is observing
fall monarch migrants, relate weather conditions to monarch abundance and activity.
Questions to consider include:
- What was the weather like on the days you saw monarchs?
- What were the conditions like after you stopped seeing monarchs?
- How do you think cold weather affects the monarchs?
- What happens to flowers in our area after it freezes?
- What happens to milkweed after it freezes?
- What do you think would happen to the monarchs if they were in our area after it
freezes?
- Send your data and any comments to us at:

Dr. Karen Oberhauser
University of Minnesota
Department of Fisheries and Wildlife
200 Hodson Hall, 1980 Folwell Ave.
St. Paul MN 55108
Worksheets
The following is an example of the worksheet necessary for this lesson.
You may print it directly from the site. If you experience problems, please email us
at webadmin@monarchlab.org
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