What’s Going On in This Graph? | Sept. 22, 2021

How has the “normal” amount of precipitation changed across the United States?

What’s Going On In This Graph? | Sept. 22, 2021

The New York Times – by The Learning Network

These graphs, which are data maps called choropleths, show the 30-year precipitation levels compared to the 20th century precipitation average for the time periods 1901-1930, 1931-1960, 1961-1990 and 1991-2020. The data was gathered from 15,000 weather stations from around the country, including more than 8,000 stations operated by volunteers. Started in 1890, this volunteer effort is one of the oldest and largest citizen-science projects anywhere. The graphs appeared elsewhere in the NYTimes.com.

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