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• • CLIMATE <br />Relative Humidity <br />Related to temperature is relative humidity. This, in turn, is related to growth stresses on plants <br />through vapor pressure deficit. Figure 4 shows the humidity patterns throughout the day in each month <br />over a year. Humidity is lowest in summer when the temperature is highest, but the average throughout the <br />year shows little variation. There is a slight tendency, especially at lowest humidities, to parallel the pattern <br />established in monthly precipitation. Wet summer months tend to be more humid than drier summer <br />months. Thus, during the growing season, moisture stress would be most severe in June when precipitation <br />is lowest for the summer, humidity is lowest, and temperature near its peak. July and August would see <br />some relief from the stress, even though temperatures are higher. Humidity would be higher and therefore <br />the vapor pressure deficit (actually an evapotranspiration gradient) would be lower. Also, precipitation is <br />higher. These patterns are reflected in the vege[ation growth patterns in this area as well as <br />evapotranspiration reduction adaptations exhibited by the various species. <br />Ave. Mo. Rel. Humidity at 4 times <br />Piw <br />m - <br />~ ; {~. .. i_ .l III ` ;~ ` I l ~~ -I~ ~~.` . <br />_~ ~ ~ .~ <br />` \ \ i <br />~ ~` ~ <br />s~ va wv w ~ U „ ry s<o m w n~ <br />- - - ~~ - - <br />^ sw 8 nw ~ sw ~ nw <br />Figure 4: Relative humidity patterns. <br />Grisenti Farms Gravel Pit Original Application Exhibit K Page G-6 <br />