. Bulletin. 1901-13. Agriculture; Agriculture. EXAMPLES OE DROUGHT RESISTANCE. 11 Table I.âAverage rainfall by months and annual average for Casa Grande, Phoenix, Maricopa, and Mesa, Ariz., for the years from 1897 to 1908, ; Station. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. In. .78 In. .90 .72 In. .51 .38 .80 In. .51 .33 .49 In. .05 .04 .08 In. .11 .16 .12 In. .91 .S3 In. .98 .83 In. .98 .52 .59 In. 60. 13 .32 .25 .35 In. .89 .72 .861 In. .72 .78 .01 In. 6 6
. Bulletin. 1901-13. Agriculture; Agriculture. EXAMPLES OE DROUGHT RESISTANCE. 11 Table I.âAverage rainfall by months and annual average for Casa Grande, Phoenix, Maricopa, and Mesa, Ariz., for the years from 1897 to 1908, ; Station. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. In. .78 In. .90 .72 In. .51 .38 .80 In. .51 .33 .49 In. .05 .04 .08 In. .11 .16 .12 In. .91 .S3 In. .98 .83 In. .98 .52 .59 In. 60. 13 .32 .25 .35 In. .89 .72 .861 In. .72 .78 .01 In. 6 Average 1 a The figures of this table were kindly furnished by Mr. L. N. Jesunofsky, section director, Weather Bureau, Phoenix, Ariz. .,, ,, ._ , . , , .. 6 These means were obtained by substituting the mean of the month specified in places where the record was wanting. Figure 2 shows graphically 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. Fig. 1.âMap showing the points in Arizona and southern California where dry-land olive growth was studied. August and one in November, with May and June nearly rainless, are characteristic of the region. The range of temperature during the year is from a minimum of 25° or 28° F., witli 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 graphically illustrated in figure 3 will not be far I'rniu correct for the Casa Grande region. IT. Mean monthly ami main annual relative humidity of Phoenix, Ariz., for ///, years 1905, 1906, and 1907. Year. Jan. Feb. Mil Apr. May. June July. \ug. Sept. Oct. Nov. l>, , I'.ct 65 12 Year. no, hi 66 71 60 58 I'.ct. 87 IS 61 /â ,i 58 in 30 ::i 28 â¢j:, 211 24 I'.ct. â¢J'.l :;i I'.c
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