The number in each black circle is the percent change over the entire period (1958–2016).Īnnual precipitation in the Great Lakes region has generally increased over the past several decades. The map shows percent increases in the amount of precipitation falling in daily events that exceed the 99th percentile of all non-zero precipitation days (top 1 percent of all daily precipitation events) from 1958 to 2016 for each region of the United States. Temperatures in the winter and at night are warming faster than in other seasons or in the daytime. The average temperature in northern portions of the region has increased by more than 1.5☏ compared to the 1901–1960 average, and the rate of warming has increased in the last decade. Temperatures in the Great Lakes region have been rising over the past several decades. These impacts are particularly concerning to the region because a major component of the regional economy relies on the fisheries, recreation, tourism, and commerce generated by the Great Lakes and the northern forests. The effects of increased heat stress, flooding, drought, and late spring freezes may be magnified by other changes, such as a change in the prevalence of diseases and pests, increased competition from invasive species, land use change, an increase in air pollution, and economic shocks from extreme weather events. Note on regional modeling uncertaintiesĬlimate change will tend to amplify existing risks that impact people, ecosystems, and infrastructure.
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