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28 30 32 

 WEEK 



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Figure 6. — Minwium temperatures of shaded and unshaded soil surfaces at the station 

 on the southeast exposure at 7^100 feet elevation: average weekly means and 

 absolute minimums for the 5-year period. 



Table 9, .--Average^ durations of maximum temperatures minus 5° P. 



and minimum temperatures plus 6° F. on the unshaded 

 soil surface at the station on the southwest exposure 

 at the 7 , 100-foot elevation 



Year ; May ; June ; July ' Aug. ; Sept. ' Oct. 



-Hours - 



1964 Max. 1.7 1.9 2.3 2.4 2.1 2.0 

 Min. 5.2 7.1 4.1 5.2 5.7 5.8 



1965 Max. 6.2 1.8 1.7 2.0 7.6 3.9 

 Min. 11.8 6.1 5.1 6.3 13.1 9.2 



1966 Max. 2.8 1.1 1.8 1.6 1.6 4.5 

 Min. 7.1 5.0 4.5 4.5 5.5 8.9 



1967 Max. 2.9 1.3 1.4 2.0 1.4 3.0 

 Min. 9.0 6.7 5.0 4.9 5.6 10.2 



1968 Max. 3.6 2.3 1.7 1.3 1.8 2.5 

 Min. 9.1 7.0 4.5 6.3 7.1 9.8 



5-year average: 



Max. 3.4 1.7 1.8 1.9 2.9 3.2 



Min. 8.5 6.4 4.6 5.4 7.4 8.8 



Standard deviations averaged 2.9 hours for maximum and 3.7 hours 

 for minimum temperature durations . 



