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This report summanzes stream-temperature data collected by the US Geological Survey m cooperatiOn with the State of North Carolma durmg the penod 1943-67 Listed m two tables are summary values determmed from records f10m 176 locations throughout the State Of the 850 station years of record, 31 percent IS monthly records, 50 percent IS daily, and 19 percent IS contmuous Table 1 shows average monthly, average annual, and extreme observed temperatures for the penod of record at each location Table 2, for stations havmg contmuous water-temperature recorders, shows the followmg temperatme variables Average of monthly maximums, average of daily ma:>..Imums, average daily, average of daily mm1mums, and average of monthly m1mmums INTRODUCTION Water In streams IS used for many purposes, and Its acceptabilIty for a specific use often depends on the temperature of the water Careful plannmg for the most beneficial use of water requires knowledge of seaonsal and annual averages and extremes of temperature for such activities as producing goods and making related heat-transmiSSIOn calculations, developing areas for swimming and boatmg, stocking streams with fish and preserving an environment suitable for their health and continued reproqucbon, selecting hatchery sites, designing facihbes for storage and treatment of water, and regulating thermal pollution In streams. Thermal pollutiOn In streams has become an Increasing concern In recent years. The excessive heat can cause changes In stream ecology, Including heavier growth of undesirable vegetation and Inhibition of the reproductiOn of certain species of fish. Within those reaches of streams In which thermal pollution occurs, the quahty of water may be adversely affected for commercial fish-

Summary of data on temperature of streams in North Carolina, 1943-67