r.AKOMKTIMCAL AM) MKTKDKOlAMill' 



Utah, in > 



mess of the skv Let ween the In 

 and, including the hours of tl 



nch; the r 



\ 0.9N o-rai 



dative humidi 



n troy. Nob. 



V A. whit 



•li were taken 



zither rain 



nor dew fell, 



Basin. A very slight discretionary correction has onlv heen made in Xo. Ill 1). 



No. IV Cand D was deduced from 1!) (lavs' observations taken at Camp Floyd, 



Utah, from April 4 to April 23, 1859, at an elevation of 4,860 Feet above the level of 



the sea. The mean temperature was 42°.0 Fahrenheit; the mean force of vapor, 0.155 

 inch; the relative humidity, 57.0; and the mean weight of vapor in 1 cubic foot of air, 

 1.68 grains troy. No. IV C and 1) correspond to No. IV B, and very nearly also to No. V 

 A, which together form one set. During the time of these observations it snowed on nine 

 occasions and rained on one, in an aggregate 22 hours, of which 10 hours were on the 

 9th, the remainder on the 10th, 1 1th, 12th, and l.-Jth. The whole precipitation probably 

 did not exceed '0.5 inch of water. The cloudiness of the sky between the hours of 

 6 a. m. and 9 p. m. averaged 5.37, and, including the hours of night, by interpolation, 

 5.10. The clouds were mostly cumuli. During 18 hours out of 100 the sky was 

 cloudless. This rather large cloudiness has its cause in the altitude of the surround- 

 ing mountain ranges, which were still extensively covered with snow, while the tem- 

 perature in the deserts to the west was already high and the evaporation strong. 

 The 312 hourly observations of the wind during that time, between (J a. m. and 9 p. 

 m., give the following results : 



North, north-northeast, and northeast winds. 33.3 per cent., with an average force of 2 8. 

 South and southeast winds, 12.8 per cent., with an average force of 3.4. 

 Southwest and west-southwest winds, 9.3 per cent., with an average force of 4.0. 

 West and west-northwest winds, 8.3 per cent., with an average force of 2.0. 

 Northwest and north-northwest winds, 6.1 per cent., with an average force of 1.8. 

 East, east-southeast, and southeast winds, 10.3 per cent., with an average force of 2.3 

 Perfect calmness, 19.9 per cent. 



This table of winds will be better understood and appreciated if I mention that 

 the north and northeast winds pass longitudinally over Cedar Valley, the valley in 

 which Camp Floyd is situated, coming over low hills from the Salt Lake Valley. The 

 south and south-southeast winds, and the southwest and west-southwest winds, the 

 strongest winds, pass also more or less longitudinally over the valley, the former from 

 the valleys at the base of the AVahsatch range; the latter over low mountains, from 

 the vast" deserts in the direction of Sevier Lake. The west and west-northwest 

 winds pass across the valley, entering it from Rush Valley. They acquire less force 



