Table 1. Month Average meteorological data for study sites at TTR (Great Basin Desert) and Rock Valley (Mojave Desert). Tonopah Test Range Rock Valley (1961-1969) (1963-1970) Precipitation T°c cm max min Snow Rainfall T°¢c cm cm max min Jan, 0.6 7 -10 5.1 1.8 20 -8 Feb. 1.7 9 -6 17.0 1.5 21 -5 Mar. 0.4 12 -4 7.9 0.9 27 -3 Apr. 1.1 17 -1 7.9 1.4 29 -1 May 1.1 | 22 4 5.1 0.4 35 4 June 1.7 27 9 0.0 0.5 39 8 July 1.0 32 12 0.0 1.3 41 17 Aug. 2.4 31 12 0.0 1.4 41 15 Sept. 1.2 26 7 0.0 0.6 36 10 Oct. 0.3 21 2 0.3 0.3 32 4 Nov. 1.0 12 -4 4.1 1.8 25 -2 Dec. 0.5 7 -8 4.6 1.3 19 -7 13.0 - - 52.0 13.2 - - Totals 66