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Scientific Investigations Report 2007–5179

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179

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Table 1. Average annual temperature, average annual precipitation, and estimated evaporation rates for regional National Water-Quality Assessment Program study units in the arid to semiarid Western United States, 1993–2004.

[See figure 1 for location of study units. Average annual temperature and precipitation: National Oceanic and Atmospheric Agency (NOAA), 2006; temperature to the nearest degree; precipitation to nearest tenth of an inch. Estimated evaporation rates: Kohler and others, 1959; Class A Pan evaporation. Abbreviation: °F , degrees Fahrenheit]

Study unit Average
annual
temperature
range
(°F)
Average
annual
precipitation
(inches)
Estimated
evaporation
rates
(inches
per year)
Central Arizona Basins 62–86 8.3 80–105
Great Salt Lake Basins 41–63 16.5 50–60
Nevada Basin and Range 35–80 4.5–7.5 65–110
Rio Grande Valley 23–70 7.2–9.5 50–105
Sacramento River Basin 48–74 17.9 65–75
San Joaquin-Tulare Basins 49–77 6.5–13.8 65–90
Southern California Basins 58–71 10.8 60–70

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