Scientific Investigations Report 2006-5252
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5252
Table 8. Total monthly, total annual, and average monthly Lake Mead evaporation, 1953–95.
[Historical references for this table are U.S. Geological Survey, 1961–64, 1965–75, 1976–82; Hendricks, 1964; Frisbie and others, 1983–85; Pupacko and others, 1988, 1989a, 1989b, 1990; Bostic and others, 1991; Garcia and others, 1992; Hess and others, 1993; Emett and others, 1994; Clary and others, 1995; and Bauer and others, 1996. Symbol: –, no data available]
| Total evaporation, in inches | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Annual | |
| 1953 | 4.1 | 4.4 | 4.7 | 6.2 | 8.6 | 8.0 | 7.6 | 10.6 | 8.8 | 7.3 | 6.5 | 6.9 | 83.7 |
| 1954 | 4.3 | 3.6 | 5.9 | 5.5 | 8.3 | 8.3 | 9.8 | 9.6 | 8.4 | 8.2 | 5.5 | 6.1 | 83.5 |
| 1955 | 5.0 | 4.2 | 5.4 | 7.0 | 7.3 | 7.9 | 9.3 | 8.1 | 10.5 | 7.3 | 7.6 | 4.6 | 84.2 |
| 1956 | 4.1 | 4.8 | 5.2 | 5.9 | 7.9 | 9.5 | 9.3 | 11.5 | 7.8 | 9.1 | 7.9 | 5.8 | 88.8 |
| 1957 | 3.8 | 2.6 | 4.8 | 6.0 | 6.2 | 8.3 | 8.9 | 10.7 | 7.6 | 7.7 | 8.2 | 5.7 | 80.5 |
| 1958 | 4.9 | 2.7 | 4.9 | 4.0 | 8.1 | 9.5 | 10.5 | 9.6 | 9.5 | 8.6 | 6.5 | 4.3 | 83.1 |
| 1959 | 4.2 | 3.8 | 5.1 | 5.1 | 8.1 | 8.4 | 9.6 | 9.5 | 9.8 | 8.0 | 6.1 | 5.7 | 83.4 |
| 1960 | 3.6 | 4.6 | 4.6 | 6.0 | 7.0 | 9.0 | 9.4 | 11.9 | 7.1 | 7.3 | 5.8 | 5.6 | 81.9 |
| 1961 | 3.5 | 3.7 | 5.0 | 5.0 | 8.2 | 9.1 | 9.8 | 9.0 | 9.9 | 8.2 | 6.3 | 4.7 | 82.4 |
| 1962 | 4.5 | 3.2 | 6.0 | 4.2 | 8.0 | 8.0 | 10.2 | 11.0 | 8.8 | 9.2 | 5.4 | 4.6 | 83.1 |
| 1963 | 5.5 | 3.9 | 4.7 | 6.4 | 7.2 | 8.0 | 10.6 | 10.2 | 7.5 | 6.6 | 7.0 | 5.4 | 83.0 |
| 1964 | 5.2 | 4.8 | 5.0 | 6.0 | 4.6 | 7.4 | 10.2 | 9.3 | 8.7 | 6.3 | 7.1 | 4.9 | 79.5 |
| 1965 | 3.4 | 3.8 | 4.0 | 4.2 | 6.3 | 7.1 | 7.9 | 9.7 | 9.4 | 5.2 | 5.0 | 4.9 | 70.9 |
| 1966 | 4.6 | 3.6 | 4.1 | 6.4 | 6.8 | 8.0 | 10.1 | 10.0 | 7.4 | 7.2 | 5.5 | 5.2 | 78.9 |
| 1967 | 4.5 | 3.5 | 5.5 | 6.2 | 5.6 | 6.7 | 7.8 | 7.6 | 9.0 | 8.4 | 5.1 | 7.0 | 76.9 |
| 1968 | 4.0 | 2.3 | 4.3 | 5.8 | 6.8 | 7.5 | 7.0 | 7.5 | 8.1 | 7.7 | 7.6 | 6.9 | 75.5 |
| 1969 | 3.4 | 3.2 | 4.3 | 6.1 | 5.8 | 8.5 | 6.9 | 8.8 | 7.8 | 9.2 | 5.6 | 5.6 | 75.2 |
| 1970 | 4.2 | 3.1 | 4.6 | 5.9 | 6.8 | 6.4 | 7.5 | 7.3 | 10.1 | 9.5 | 6.8 | 5.6 | 77.8 |
| 1971 | 4.3 | 4.5 | 5.0 | 6.3 | 6.2 | 7.5 | 7.8 | 8.2 | 10.6 | 7.7 | 6.0 | 6.8 | 80.9 |
| 1972 | 4.2 | 2.9 | 4.2 | 6.2 | 7.4 | 7.5 | 9.4 | 8.3 | 7.9 | 7.3 | 5.8 | 6.8 | 77.9 |
| 1973 | 4.5 | 2.2 | 3.3 | 4.3 | 5.7 | 8.1 | 11.1 | 10.5 | 10.0 | 8.6 | 7.5 | 5.2 | 81.0 |
| 1974 | 3.6 | 4.3 | 4.3 | 5.6 | 7.4 | 7.1 | 9.4 | 7.4 | 8.6 | 8.9 | 5.6 | 7.4 | 79.6 |
| 1975 | 5.7 | 6.3 | 5.6 | 5.7 | 6.6 | 9.2 | 10.8 | 12.6 | 6.9 | 11.5 | 9.1 | 4.8 | 94.8 |
| 1976 | 3.8 | 3.6 | 5.1 | 5.7 | 5.2 | 9.7 | 8.5 | 10.6 | 7.4 | 7.5 | 6.0 | 6.0 | 79.1 |
| 1977 | 4.1 | 3.4 | 5.7 | 4.4 | 6.1 | 6.0 | 9.4 | 9.6 | 9.7 | 6.5 | 6.4 | 4.2 | 75.5 |
| 1978 | 3.7 | 3.7 | 3.4 | 4.3 | 6.2 | 7.9 | 7.7 | 10.5 | 8.6 | 6.7 | 5.6 | 6.8 | 75.1 |
| 1979 | 4.6 | 3.3 | 3.3 | 4.5 | 6.5 | 8.0 | 8.3 | 9.0 | 7.1 | 9.3 | 8.1 | 4.5 | 76.5 |
| 1980 | 5.1 | 3.5 | 4.1 | 4.0 | 6.7 | 7.2 | 9.4 | 9.1 | 6.2 | 7.9 | 6.0 | 3.5 | 72.7 |
| 1981 | 3.5 | 2.9 | 3.2 | 5.0 | 4.1 | 6.9 | 9.6 | 6.9 | 7.7 | 7.9 | 5.1 | 4.9 | 67.7 |
| 1982 | 3.8 | 2.3 | 4.6 | 3.5 | 6.5 | 8.3 | 6.3 | 5.8 | 7.2 | 6.6 | 6.4 | 4.9 | 66.2 |
| 1983 | 2.4 | 2.4 | 3.6 | 5.6 | 7.2 | 8.5 | 10.3 | 7.3 | 5.6 | 6.5 | 8.7 | 3.7 | 71.8 |
| 1984 | 3.0 | 3.7 | 4.4 | 4.5 | 5.9 | 6.5 | 7.1 | 6.2 | 3.8 | 9.5 | 5.5 | 4.9 | 65.0 |
| 1985 | 3.6 | 3.7 | 4.4 | 3.3 | 4.8 | 7.0 | 7.4 | 8.4 | 6.7 | 5.5 | 6.4 | 5.0 | 66.2 |
| 1986 | 2.8 | 3.0 | 3.4 | 5.6 | 6.1 | 5.9 | 8.0 | 7.1 | 9.8 | 5.9 | 5.1 | 6.1 | 68.8 |
| 1987 | 3.4 | 3.1 | 3.8 | 3.1 | 5.5 | 6.6 | 8.8 | 7.5 | 6.8 | 5.1 | 3.6 | 5.6 | 62.9 |
| 1988 | 3.3 | 2.1 | 2.8 | 3.4 | 4.7 | 5.1 | 6.2 | 6.2 | 6.3 | 4.8 | 6.8 | 4.6 | 56.3 |
| 1989 | 3.5 | 3.1 | 4.2 | 4.5 | 5.2 | 4.9 | 7.6 | 9.8 | 4.8 | 5.2 | 3.5 | 5.5 | 61.8 |
| 1990 | 3.8 | 3.8 | 2.7 | 4.2 | 7.5 | 6.8 | 7.9 | 8.0 | 8.4 | 5.8 | 7.0 | 5.8 | 71.7 |
| 1991 | 2.8 | 2.0 | 4.2 | 2.5 | 5.8 | 9.5 | 8.4 | 11.2 | 9.6 | 9.0 | 6.9 | 5.5 | 77.4 |
| 1992 | 4.1 | 2.7 | 2.6 | 6.0 | 8.1 | 5.3 | 4.7 | 4.0 | 3.8 | 4.2 | 4.4 | 2.8 | 52.7 |
| 1993 | 1.6 | 3.0 | 2.4 | 4.7 | 8.6 | 5.1 | 12.9 | 9.8 | 9.4 | 8.1 | 9.8 | 4.7 | 80.1 |
| 1994 | 4.1 | 7.3 | 3.5 | 5.4 | 5.4 | 8.8 | 9.1 | 12.7 | 8.5 | 8.9 | 11.2 | 4.6 | 89.5 |
| 1995 | 3.2 | 2.4 | 2.5 | 2.6 | 3.0 | 8.9 | 9.3 | 12.5 | – | – | – | – | |
| Average monthly | |||||||||||||
| 1953–95 | 3.9 | 3.5 | 4.3 | 5.0 | 6.5 | 7.6 | 8.8 | 9.1 | 8.0 | 7.5 | 6.5 | 5.3 | 76.0 |
| 1953–73 | 4.3 | 3.6 | 4.8 | 5.7 | 7.0 | 8.0 | 9.1 | 9.5 | 8.8 | 7.8 | 6.4 | 5.6 | 80.6 |
| 1974–94 | 3.6 | 3.5 | 3.9 | 4.5 | 6.2 | 7.2 | 8.5 | 8.6 | 7.3 | 7.2 | 6.5 | 5.0 | 72.0 |
| Standard deviation | |||||||||||||
| 1953–73 | 0.6 | 0.8 | 0.6 | 0.9 | 1.1 | 0.8 | 1.3 | 1.3 | 1.1 | 1.1 | 1.0 | 0.8 | |
| 1974–94 | .9 | 1.3 | .9 | 1.0 | 1.1 | 1.5 | 1.8 | 2.3 | 1.8 | 1.9 | 2.0 | 1.1 | |
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