Feb. i6, 1920 



Determination of Normal Temperatures 



503 



90, and use 90 for 8 in the equation, and for the first term of the equa- 

 tion use the mean annual temperature for Salt Lake City (52° F.) 

 instead of 48.5°, and by means of a table of cosines calculate the desired 

 temperature from formula 4. 



Table I. — Mean monthly temperatures with daily and annual ranges (in degrees 



Fahrenheit) 



Station. 



County. 



u 

 a be 

 a a 



Beaver 



Castle Dale. . . . 



Corrinne 



Duchesne 



Escalante 



Farmington . . . 



Fillmore 



Ft. Duchesne. 



Heber 



Henefer 



La Sal 



Levan 



Loa 



Logan 



Manti 



Marysvale 



Meadowville. . 



Moab 



Morgan 



Ogden 



Parowan 



Provo 



Richfield 



Salt Lake City 



St. George 



Tooele 



Woodruff 



Beaver 



Emery 



Box Elder . . 

 Duchesne. . . 



Garfield 



Davis 



MiUard 



Uinta 



Wasatch .... 



Summit 



San Juan 



Juab 



Wayne 



Cache 



Sanpete 



Piute 



Rich 



Grand 



Morgan 



Weber 



Iron 



Utah 



Sevier 



Salt Lake. . . 

 Washington. 



Tooele 



Rich 



Most of the interior cities of the United States have an annual varia- 

 tion in temperature differing from that of Utah by not more than 10° F. 

 (see fig. i). Since it is this factor that largely determines the shape of 

 the curve, approximate mean daily temperatures can be obtained for 

 any of these cities by means of equation 4 by using the mean annual 

 temperature for the particular city in place of the first term (48.5). 



The series converges rather rapidly, the omission of the fourth term 

 making an error of one-half of i per cent and the omission of the third 

 and fourth terms making an error of 2 per cent. 



DAILY TEMPERATURE CHANGE 



The difference in temperature between day and night in Utah — that 

 is, between the maximum and the minimum for the 24 hours — is about 

 30° F. in summer and only about 15° in winter. This is because the 

 sun attains a greater altitude at noon in the summer and heat is being 

 received from the sun more rapidly on unit area than in the winter time, 

 which causes the temperature to rise faster and reach a higher value 

 for the same time period. Cooling takes place faster at night in the 



