Scientific Investigations Report 2007–5179
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179
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 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5179
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