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<br />00 <br />CO <br />N <br /> <br />Growing Season <br /> At Rifle, from 1912 to 1926 the last tempero. tur e of 320 <br />occurred as early as April 17 ane as late as June 3, while the <br />first temperature 0 early as September 14 and as late <br />of 32 came as as <br /> <br />October 24. (See Plate I). The growing season based on minlinum <br /> <br />o <br />temperature of 35 hqs been recorcec with same lapses to the present, <br /> <br />as is also shewn on Plate I. While these data indicate the limits <br /> <br />of the growing season for fruits and the more delicate plants, they <br /> <br />CO not define the grOwing season for harcy crops. The minimum <br /> <br />temper~tures occur at night while dny temper~tures have become, or <br /> <br />are still, favorable for growth of alfalfa and grain. Growth of the <br /> <br />hardy plants will begin and continue even though the plants are some- <br /> <br />what injured for a good many successive nights. <br /> <br />i <br />,I <br /> <br />The upper altitude of the project is 7,200 feet, the average <br /> <br />over 6,000 and the lower elevation that of Silt. The average active <br /> <br />growing season prObably begins May 15 anr} enos on September 27 for a <br /> <br />'.' <br /> <br />total of 135 days. At the higher levels the season is sarrewhat <br /> <br />i,' <br />~; <br /> <br />short for two cuttings of alfalfa which indicates a season of 120 <br /> <br />~I <br /> <br />~-~ <br /> <br />days er slightly less. <br /> <br />< <br />~~, <br /> <br />The average temperature for the project is probably about <br /> <br />" <br />" <br /> <br />that of the irrigated areas in northeastern Celorado or of the states <br /> <br />.:"'. <br />L <br />~ <br /> <br />'^ <br />;; <br /> <br />on the west side of the Mississippi River at the sane latitude. <br /> <br />The humidity is very low which has the effect of nqking <br /> <br />the extremes of temper'lture nore bearable to animal life. In dry <br /> <br />15 <br />