1951 at elevations of 6,950 and 8,000 feet. 

 The 18-year average for April 1 vi^ater content 

 at these snow courses is 23 and 28 inches, re- 

 spectively. 



Air Temperature 



Temperature records on the two study wa- 

 tersheds were maintained from 1956 to 1959 

 and during the summer of 1962. Winter rec- 

 ords were sporadic, but missing records were 

 estimated by using the equation (Y= 1.059 X - 

 4.279, with R2=0.96) derived from the ex- 

 cellent 32-year record at Rice Climatic Sta- 

 tion, located at 6,900 feet elevation in Farm- 

 ington Canyon. 



The mean annual temperature at Chicken 

 Creek was a cool 36.6° F., and extreme tem- 

 peratures ranged from -20° to 88° F. Periods 

 of subzero temperatures were infrequent and 



usually brief. The mean July-through-Septem- 

 ber temperatures were consistently in the up- 

 per 50 's, and mean November- through-April 

 temperatures varied from 20° to 25° F. (fig. 5). 

 Below freezing temperatures have occurred in 

 every month of the year at some time during 

 the period of record. 



Additional Climatic 

 Measurements 



A climatic station was established on the 

 West Branch watershed in June 1971. Param- 

 eters being recorded are: total and net radi- 

 ation; windspeed at two elevations; wind di- 

 rection; air temperature; and relative humid- 

 ity. These data will be used to determine ener- 

 gy budget and potential evapotranspiration 

 relations for the area. 



90 r 



80 



70 



60 



50 



40 



30 



! 20 

 10 



10 



■20 



•30 



\ 



\ MAXIMUM 



J- 



M A M 

 MONTHS 



Figure 5. — Mean monthly temperature and observed maximum and 

 minimum temperatures for the periods 1956-1959 and 1962. 



6 



