DKY-LAND GRAINS IN THE GVUEAT BASIN. 



LOCATION. 



The sul)station is situated in tlio eastern i^ait of Jual) County, 

 Utah. It comprises 102 acres of land on the Levan Ridge, 6 miles 

 south of the town of Nephi, in the Juab Valley. Its elevation is 

 approximately 6,000 feet. 



• RAINFALL. 



The primaiy climatic factor in dry-land farming in the western 

 United States is tlu^ rainfall. This is subject to wide monthly and 

 annual variation and, ])articularly in the Ilocky Mountain vStates, con- 

 siderable difrerences are found in the quantities and distribution of 

 the precipitation received by localities not widely separated. Table I 

 reports the rainfall of the Juab Valley for the years 1898 to 1 909, inclu- 

 sive. From 1898 to 1 903, inclusive, the observations were made by the 

 United States Weather Bureau observer at Levan, 6 miles south of 

 the substation, but since January 1, 1904, a record has been kept at 

 the substation. 



Table I.— Precipitation {in inches) in the Juab Valley, Utah, for each month from 1S98 

 to 1909, inclusive, with averages and maximums and minimums for each month. 



aT. = trace. 



Table I shows that, during the twelve years, the total annual 

 precipitation has varied from 18.48 inches in 1906 to 10.34 inches 

 in 1900, the average annual amount being 14.43 inches; that six years 

 have received more than the average amount and six years less than 

 the average, and that only two of the years have received less than 

 12 inches. 



Table I shows further the highest and the lowest amount of pre- 

 cipitation occurring in each month during the twelve-year period, 

 together with the twelve-year average for each month. A very 

 important fact shown by the table is the low rainfall of June and July. 



[C'ir. 61] 



