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This Week's Weather and the Rubythroat Migration
April 18th was the biggest day this past week for ruby-throated hummingbird reports. Look at that day's precipitation and temperature maps.

Think: Why do you think so many new rubythroat sightings were reported that day?

Precipitation: April 18, 2009

Temperatures: April 18, 2009

On April 18th, a large area of high pressure brought fair and dry weather to areas from the Great Lakes Region southward into the Mid-Atlantic.