The Urban Heat Island effect is real (A) Large Counties: More than 1 million people Average 29 stations (B) Midsized Counties: 100,000 to 1 million people Average 51 stations (C) Small Counties: Less than 100,000 people Average 27 stations Temperature Trends at 107 Stations in California from 1909 to 1994 Stratified by 1990 population of the county
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