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Publication Abstract

An Investigation of Historical Temperature and Precipitation Data at Climate Benchmark Stations in Illinois Changnon, Stanley A., Jr., Derek Winstanley, and Kenneth E. Kunkel, 1997  Illinois State Water Survey, Champaign, IL,  ISWS C-184    Full Text Available
Twelve weather stations in Illinois with long records (1901-1995) of temperature and precipitation were assessed as possible benchmark stations with quality data for use in studies of past fluctuations of climate and for monitoring future changes in climate. Various tests indicate that 11 stations had quality records. Temperatures in Illinois increased 2.5°F from 1900 to the 1930s, remained high until the late 1950s, and decreased by 2.5°F since. Precipitation since 1900 has varied regionally, increasing in the north and west, and remaining unchanged in the south. The number of droughts has not changed over time, but the number of days with 2-inch and 3-inch rainfall has increased over the past 30 years while the number of days with 4-inch rainfall has not changed. Climate changes in Illinois are discussed in the context of global climate change.

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