. Bulletin. Agriculture. EXAMPLES OF DEOUGHT RESISTANCE. 11 Table I.—Average rainfall by months and annual average for Casa Grande, Phoenix, Maricopa, and Mesa, Ariz., for the years from 1897 to 1908, inclusive.^' Station. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Casa Grande In. .78 In. 0. 80 .90 .72 In. .51 .38 .80 In. .51 .33 .49 In. .05 .04 .08 In. .11 .16 .12 In. .91 .83 In. .98 .83 In. .98 .52 .59 In. .32 .25 .35 In. .89 .72 .861 In. .72 .78 .01 In. 6 Phoenix Maricop
. Bulletin. Agriculture. EXAMPLES OF DEOUGHT RESISTANCE. 11 Table I.—Average rainfall by months and annual average for Casa Grande, Phoenix, Maricopa, and Mesa, Ariz., for the years from 1897 to 1908, inclusive.^' Station. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. Casa Grande In. .78 In. 0. 80 .90 .72 In. .51 .38 .80 In. .51 .33 .49 In. .05 .04 .08 In. .11 .16 .12 In. .91 .83 In. .98 .83 In. .98 .52 .59 In. .32 .25 .35 In. .89 .72 .861 In. .72 .78 .01 In. 6 Phoenix Maricopa Mesa Average a The figures of this table were kindly furnished by Mr. L. N. Jesunofsky, section director, Weather Bureau, Phoenix, Ariz. 6 Ttiese means were obtained by substituting the mean of the month specified in places where the record was wanting. Figure 2 shows graj^hically the average rainfall by months for Casa Grande, Ariz., and adjacent stations, from 1897 to 1908, inclusive. The two periods of greater rainfall each year, one culminating in Soefre^fr ar/. Fig. 1.—Map showing the points in Arizona and southern California where dry-land olive growth was studied. August and one in November, with ^May aiul June nearly rainless, are characteristic of the region. The range of temperature during the year is from a minimum of 25° or 28° F., with occasional years as low as 17°, to a maximum of 117° to 122° F. The mean relative humidity recorded for Phoenix in Table II and grai)hically illustrated in figure 3 wall not be far from correct for the Casa Grande region. Table II.—Mean monthly and mean annual relative humidity of Phoenix, Ariz., for the years 1905, 1906, and 1907. Year. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. 1905 61 50 66 71 60 58 67 48 51 58 40 30 35 31 28 25 20 24 29 34 36 P. ct. 42 47 44 41 30 36
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