Thornthwaite factors Heat exponent PET Evapotranspiration or leaching index (cm) Station index (I) a measurement Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Amargosa Farms 89.91 1.97 PET thorn. 1.0 1.6 3.3 5.9 11.2 17.0 21.2 18.6 12.0 6.5 2.2 0.9 101.4 LI thorn. 0.5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.3 0.8 Beatty 8 N 71.06 1.62 PET thorn. 0.8 1.3 2.7 5.1 9.1 13.3 17.1 15.0 10.2 5.8 2.2 0.9 83.6 LI thorn. 0.9 0.52 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.5 1.9 Boulder City 100.94 2.21 Pan 1984 11.0 14.9 21.3 28.8 39.9 42.6 34.2 35.0 35.5 18.7 11.4 5.6 298.9 Pan 1985 8.0 10.1 17.8 24.0 36.1 40.8 37.1 40.0 25.7 17.6 12.6 10.2 280.0 Pan 1986 10.1 13.1 19.9 28.6 37.6 43.9 41.6 36.2 35.5 18.1 13.7 7.0 305.2 Pan 1987 10.0 13.3 16.7 24.2 29.3 40.3 39.2 35.5 26.5 21.0 10.0 -- 274.9 Pan 1988 10.0 13.8 22.5 19.8 33.0 43.0 43.3 31.4 27.6 20.0 12.1 11.4 287.9 Pan 1989 10.2 -- 24.1 34.6 37.5 38.7 46.1 35.8 28.4 22.7 15.1 10.6 316.9 Mean pan (6yr) 9.9 13.0 20.4 26.7 35.6 41.6 40.2 35.6 29.9 19.7 12.5 9.0 294.0 PET papa. 3.7 4.9 6.8 9.4 13.1 18.4 21.3 19.6 16.1 10.5 5.7 3.9 133.5 LI papa 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn 0.8 1.5 3.3 6.7 12.2 19.2 24.9 21.5 14.5 7.5 2.4 1.0 115.5 LI thorn 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.4 1.2 Bunkerville 90.83 1.99 PET thorn. 0.8 1.4 3.2 6.8 11.5 17.9 22.1 19.1 11.8 6.0 2.1 0.7 103.5 LI thorn. 1.8 0.48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.7 3.0 Desert National Wildlife Range 80.94 1.80 PET papa. 5.9 7.4 8.9 12.0 16.2 22.9 26.7 24.4 20.4 14.1 8.3 6.2 173.5 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn 0.8 1.4 2.8 5.6 10.0 15.1 19.3 16.9 11.2 6.1 2.1 0.8 92.2 LI thorn. 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.5 Desert Rock WMSO 80.14 1.78 PET thorn. 0.8 1.5 2.7 5.1 9.7 15.3 19.5 17.2 11.0 6.1 2.2 0.8 91.8 LI thorn. 0.6 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.3 0.9 Dyer 4 SE 46.77 1.23 PET papa. 4.3 5.4 7.0 9.3 12.7 18.2 23.0 21.2 17.4 11.7 6.6 4.6 141.6 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.0 0.7 2.1 4.2 7.8 11.3 14.1 12.3 8.3 4.5 1.2 0.0 66.6 LI thorn. 0.8 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 1.9 Goldfield 46.65 1.23 PET thorn. 0.0 0.5 2.5 5.1 7.8 12.2 14.6 13.0 7.9 5.0 1.2 0.0 70.0 LI thorn. 2.1 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 3.4 Las Vegas WSO AP 96.47 2.11 PET papa. 5.0 6.5 8.1 11.1 15.4 21.9 25.0 23.0 19.2 12.8 7.3 5.3 160.6 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.8 1.5 3.4 6.6 11.7 18.3 23.7 20.5 13.3 6.8 2.3 0.9 109.7 LI thorn. 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.9 Logandale UN Exp. Farm 93.26 2.04 PET thorn. 0.8 1.7 3.6 6.3 11.3 17.3 22.7 19.6 12.6 6.6 2.3 0.8 105.6 LI thorn. 0.9 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.3 1.2 Pahranagat Wildlife Refuge 70.48 1.61 PET thorn. 0.7 1.3 2.8 5.0 9.3 13.6 17.4 15.3 10.0 5.7 2.0 0.6 83.6 LI thorn. 0.8 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.9 1.8 Pahrump Univ of Nev. Lab 80.41 1.79 PET thorn. 0.7 1.4 3.0 5.4 9.8 15.3 19.7 17.1 11.1 5.9 2.0 0.7 92.0 LI thorn. 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 0.5 1.9 Pan evap. 5.5 7.5 14.4 15.1 26.5 29.5 31.6 27.1 20.6 13.3 6.5 5.4 203.3 Red Rock Canyon 78.86 1.76 PET thorn. 0.6 1.1 3.2 5.9 10.4 15.7 19.0 16.6 10.2 5.8 1.9 0.6 91.0 LI thorn. 1.3 0.2 2.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.8 1.3 7.1 Sarcobatus 132.63 3.09 PET thorn. 0.6 1.5 3.7 9.1 17.6 31.7 46.9 39.1 25.5 11.0 3.2 1.1 190.9 LI thorn. 0.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0 0.0 Searchlight 85.78 1.89 PET papa. 4.0 5.2 6.7 9.2 12.6 17.5 19.8 18.0 15.3 10.2 5.9 4.1 128.5 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.9 1.5 3.0 5.7 10.1 15.6 19.7 17.1 12.0 6.6 2.5 1.0 95.8 LI thorn. 1.3 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 2.7 Silverpeak 62.60 1.48 Pan 1984 -- -- -- -- 39.5 38.7 38.2 27.9 26.4 -- -- -- -- Pan 1985 -- -- -- 26.3 36.8 43.3 44.1 41.4 24.8 17.1 -- -- -- Pan 1986 -- -- -- 25.0 37.9 43.7 43.2 37.1 27.1 -- -- -- -- Pan 1987 -- -- -- -- 26.0 39.8 42.3 39.3 26.3 15.9 -- -- -- Pan 1988 -- -- -- -- 35.2 41.1 47.2 36.9 26.3 17.0 -- -- -- Pan 1989 -- -- -- 29.8 32.7 40.4 49.1 37.5 30.5 17.9 -- -- -- Mean pan (6yr) -- -- -- 27.0 34.7 41.2 44.0 36.7 26.9 17.0 -- -- -- PET thorn. 0.1 0.9 2.4 4.7 9.1 13.8 17.0 14.6 9.7 4.8 1.3 0.1 78.5 LI thorn. 0.8 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.4 Tonopah AP 47.01 1.23 PET papa. 3.5 4.2 5.4 7.4 10.3 14.9 19.2 17.6 13.9 9.3 5.3 3.7 114.6 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.0 0.5 1.8 3.9 7.6 11.6 14.3 12.5 8.4 4.6 1.2 0.0 66.6 LI thorn. 0.8 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 2.1 Baker 113.54 2.52 PET thorn. 0.8 1.7 3.9 7.5 14.5 24.0 30.7 26.4 16.4 8.0 2.6 0.8 137.3 LI thorn. 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.7 Beaumont 1E 75.15 1.69 PET papa. 5.4 6.6 7.3 9.4 11.9 17.1 22.9 21.8 18.6 13.1 8.1 5.9 147.9 LI papa. 2.4 0.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.7 PET thorn. 2.1 2.3 3.2 4.9 7.6 10.8 14.8 13.9 10.5 6.8 3.6 2.3 82.6 LI thorn. 5.7 5.2 4.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 3.8 20.0 Bishop WSO AP 57.44 1.40 PET papa. 5.5 6.7 8.1 10.5 14.4 20.3 25.5 23.9 19.5 13.6 8.4 6.1 162.4 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.5 1.3 2.6 5.0 8.3 11.8 14.9 12.9 8.8 5.1 1.9 0.6 73.9 LI thorn. 3.1 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.5 5.8 Blythe 121.81 2.75 PET papa. 8.6 10.7 12.8 16.8 21.6 28.5 30.0 27.8 26.3 19.0 11.9 8.7 222.9 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 1.3 2.1 4.3 8.2 15.0 23.9 32.8 28.9 19.3 9.2 3.0 1.3 149.3 LI thorn. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 Borrego Desert Park 120.27 2.71 PET thorn. 1.8 2.6 4.5 7.2 13.2 22.2 29.4 26.0 17.9 9.5 3.9 1.8 139.9 LI thorn. 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.2 Death Valley 140.30 3.35 Pan 1984 12.1 16.2 27.3 33.4 43.7 47.4 40.7 40.8 31.3 23.4 14.7 6.5 337.4 Pan 1985 10.3 12.9 23.7 32.0 38.5 39.4 38.8 41.8 28.5 20.6 10.5 7.2 304.1 Pan 1986 8.1 12.7 21.2 28.7 34.3 48.8 45.1 44.9 33.0 20.5 16.3 6.1 319.8 Pan 1987 9.1 15.2 20.8 33.3 29.7 19.9 18.7 19.3 12.0 -- -- -- 221.3 Pan 1988 -- -- 21.8 -- 36.5 37.9 46.0 39.2 32.4 23.6 12.9 12.7 310.4 Pan 1989 -- -- 27.5 38.3 39.6 45.2 48.9 45.0 29.4 20.8 12.0 8.7 329.7 Mean pan (6yr) 9.9 14.2 23.7 33.1 37.1 39.8 39.7 38.5 27.8 21.8 13.3 8.2 307.1 PET papa. 7.3 9.7 12.0 16.0 20.6 27.3 32.2 30.0 26.7 18.6 10.6 7.4 218.5 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 0.6 1.6 4.7 11.0 22.6 40.2 58.9 48.7 26.8 10.1 2.3 0.6 228.1 LI thorn. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 El Centro 2SSW 121.02 2.73 PET papa. 9.4 11.2 13.2 16.6 22.1 29.4 31.0 28.7 26.9 20.0 12.9 9.6 231.0 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 1.5 2.3 4.4 7.7 13.9 22.0 30.5 27.9 19.1 9.7 3.5 1.6 144.1 LI thorn. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Iron Mountain 126.67 2.90 PET papa. 6.3 8.1 9.7 12.7 16.8 23.0 26.3 24.7 22.0 15.6 9.2 6.6 181.0 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 1.2 1.9 4.1 8.5 16.4 27.2 36.7 31.8 20.7 9.8 3.2 1.3 162.8 LI thorn. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Lake Arrowhead 44.08 1.19 PET papa. 2.8 3.6 4.4 5.7 7.3 9.9 11.7 11.2 10.6 7.4 4.0 2.9 81.7 LI papa. 17.2 15.1 11.9 3.1 0.0 0.0 0.0 0.0 0.0 0.0 8.1 13.1 68.6 PET thorn. 0.9 1.2 2.2 3.8 6.4 9.3 12.2 11.3 8.6 5.3 2.3 1.1 64.5 LI thorn. 19.1 17.4 14.1 5.0 0.0 0.0 0.0 0.0 0.0 0.0 9.9 15.0 80.5 Mitchell Caverns 82.48 1.82 PET thorn. 1.2 1.6 2.7 5.1 9.4 14.9 18.5 16.2 11.2 6.7 2.7 1.3 91.7 LI thorn. 1.7 1.7 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 4.8 Mountain Pass 65.81 1.53 PET thorn. 0.7 1.2 2.4 4.4 8.2 12.9 16.5 14.3 9.9 5.5 2.1 0.8 79.1 LI thorn. 1.5 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 3.3 Mt. Wilson 2 55.45 1.36 PET papa. 3.2 3.4 3.7 4.6 5.7 7.9 9.3 9.2 8.4 6.3 4.2 3.4 69.4 LI papa. 13.9 14.0 11.7 2.6 0.0 0.0 0.0 0.0 0.0 0.0 6.7 9.5 58.4 PET thorn. 1.7 1.7 2.3 3.8 6.4 9.7 12.9 11.9 9.2 6.0 3.2 2.0 70.8 LI thorn. 15.3 15.6 13.2 3.4 0.0 0.0 0.0 0.0 0.0 0.0 7.8 11.0 66.3 Needles FAA AP 125.42 2.86 PET papa. 6.1 8.0 10.0 13.2 17.6 24.0 26.0 23.7 21.3 15.0 8.8 6.2 180.1 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 1.0 1.8 3.9 8.1 16.5 27.7 38.1 32.4 20.7 9.4 2.9 1.1 163.6 LI thorn. 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.7 Parker Reservoir 129.37 2.98 PET papa. 6.2 7.9 9.3 12.4 16.6 22.6 24.5 22.8 20.8 15.1 9.0 6.5 173.7 LI papa. 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PET thorn. 1.0 1.9 4.2 8.8 17.1 28.4 38.7 34.0 22.6 10.6 3.1 1.2 171.5 LI thorn. 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 1.2 San Bernardino County Hospital 83.83 1.85 PET papa. 7.8 8.5 8.7 10.5 12.5 17.4 24.0 22.9 20.4 15.2 10.8 8.5 167.2 LI papa. 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 PET thorn. 2.4 2.8 4.1 5.7 8.2 11.2 15.1 14.3 10.8 7.0 3.9 2.6 88.1 LI thorn. 5.7 5.1 2.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.1 17.8