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Climate ~( <br />ie semiarid climate of Otero County ical <br />o~ie high plains, modified by the effect of the <br />mountains to the west. Pletiger and variable precip- <br />itation from }'ear to year, abundant sunshine, low <br />humidity, wide temperature ranges, and considerable <br />wind movement are characteristic. <br />The weather of the area is influenced by air <br />movement from four main sources. The mast common <br />source is dry and usual]}• relatively warm air from <br />the southwest. During winter, invasions of cold air <br />from the north bring occasional blizzards and sharp <br />drops in temperature for periods extending 3 to 5 <br />days. Etc ept for such cold spells, winter weather <br />is generally open and relatively mild. After cross- <br />ing the Rocky Dlountains, Pacific maritime air from <br />the west brings little moisture to the area. It is <br />frequently associated with storms to the north and <br />with high winds late in winter and in spring. Air <br />from the Gulf of Mexico in spring, summer, and fall <br />brings warm temperatures and higher humidity. It is <br />the principle source of moisture for the thunder- <br />shower activity', which is responsible for precipi- <br />tation during the growing season. <br />Temperature and precipitation for Otero County <br />are summarized in table 9. The probabilities of the <br />last freed ng temperature in spring and the first in <br />the fall are given in table 10. <br />~_ <br />Prepared b}• J. h'. BERRI', climatologist for <br />Colorado, National heather Bureau Service, U.S. <br />Department of Commerce. <br />77 <br />TABLE 9.--T EPIP ERATURE AND PRECIPITATION, OTERO COUNTY, COLORADO <br />[All data from Rocky Ford in Otero County] <br /> Temperature Precipitation <br /> Two years in 10 will Two }•e ars in 10 <br /> have ax least 4 days will <br />Month Average Average with-- have-- Days <br />with Average <br />th of <br />de <br /> daily daily Average p <br /> maximum minimum ~tasimum t•li nimum total <br />M snow <br />over snow on <br />days with <br /> temperature temperature Less are c <br /> equal to or equal to or than-- than-- snow cove <br /> higher lower <br /> than-- than-- <br /> °F, °F. °F. °F. In. In. Tn. No. In. <br />January--- 46 14 63 -6 0.43 0.1 0.9 7 3 <br />4 <br />February-- 51 19 69 1 .35 .1 .9 <br />1 5 <br />3 5 <br />March----- SS 25 75 7 .72 .2 1. 1 2 <br />April----- 69 36 94 ~ 23 1.45 .5 1.7 <br />2 <br />9 0 <br />Ata <br />Y------- 77 46 91 35 2.02 .7 • <br /> <br />June------ <br />89 <br />55 <br />100 <br />46 <br />1.26 <br />.3 <br />2.1 <br />0 --- <br />July------ 94 60 ]O1 54 1.74 .7 2.7 0 --- <br />August---- 91 59 99 51 1.70 .9 2.1 0 <br />0 =__ <br />September- 84 49 96 33 1.07 .; 1.4 <br />4 <br />1 (1/) 1 <br />October--- 73 36 S6 25 .79 .1 . i 5 <br />November-- 57 23 73 9 .46 .1 .6 . 3 <br />December-- 49 17 66 1 .32 .1 .5 <br />0 4 <br />23 4 <br />Year---- 70 37 2( L03 3/-IS 12.31 8.0 16. <br />1/ 2/ ~i <br />Less than one-half day. Average lii ghest annual maximum. Average lowest annual minimum. <br />