316 



REPOET UNITED STATES GEOLOGICAL SURVEY. 



As was stated above, nearly all of this rain-fall is in the form of sud- 

 den showers, of short duration, and of small extent. Owing mainly to 

 this last feature, the annual rain-fall will be found to differ very ma- 

 terially even between points but a few miles apart. This is especially 

 the case among the mountains, where all the climatic conditions are 

 modified very much by local topography. 



Proceeding westward over the plains, the rain-fall is £:een to decrease 

 in amount and become more variable in character. Entering the mount- 

 ains, the precipitation is noticed to inci-ease in quantity, still, however, 

 preserving its character. The winter precipitation is husbanded in the 

 form of snow, which, in the late spring and early summer, melts and, 

 swelling the streams, is utilized for irrigation. The mountains thus 

 play, in a measure, the part of reservoirs. 



Farther west, on the lower plateaus, the rain-fall is reduced to a mini- 

 mum, and the country presents all the aspects of a desert. 



Tahle of montlily and annual mean temperatures. 





6 

 ^_ 



a 





 a 



g 

 P 



o3 



tJD 



a 

 '3 

 p< 



CO 







2 

 



"o 







1 



a 



Eh 



m 



S 

 '0 



a 



1 

 1 







M 



c 

 m 



1 



3 



a 

 

 a 



cs 













3904.V 



105° 00' 



5,250 



38° 50' 



104° 49' 



6,032 



38° 08' 



102° 50' 



3,725 



40° 15' 



103° 46' 



4,500 



38° 15' 



104° 12' 



4,300 



40° 58' 



102O 23' 



3,600 



38° 28' 



105° 15' 



5,400 



24.2 

 34.6 

 36.4 

 45.5 



39° 13' 







106° 





6,100 



9,904 







January 



23.8 

 30.7 

 26.8 

 42.4 

 50.6 

 60.8 

 64.0 

 63.2 

 .^6.0 

 47.9 

 30.3 

 33.4 



26.57 

 32. 75 

 31.85 

 46.90 

 60.28 

 67.13 

 72. 68 

 67.70 

 61.26 

 48.78 

 39. 22 

 22.45 



28.2 

 34.9 

 33.5 

 46.5 

 54.9 

 64.0 

 64.6 

 65.3 

 57.9 

 51.3 

 37.1 

 35.4 



26.01 

 35.65 

 39.68 

 49.72 

 64.74 

 74.80 

 79.65 

 76.13 

 64.33 

 49.08 

 39.08 

 27.37 



19.78 

 33.67 

 30.52 

 47. 20 

 58.25 

 71.00 

 78.99 

 79.85 

 70.65 

 57.41 



"29.'3i 



32.26 

 36.23 

 41.67 

 51.73 

 63. 13 

 72. 50 

 78.79 

 73.94 

 64.38 

 50.98 

 39.78 

 27.00 



26.23 

 31.60 

 34.65 

 46.25 

 59.49 

 70.88 

 78.81 

 72. 21 

 60. 62 

 49.62 

 40.20 

 28.51 



20.0 

 21.8 





19.5 

 33.3 



April 





44.0 





57.4 





57.0 





£6.0 





49.1 













December 



36.6 



25.1 









44.1 



48.13 



47.8 



52.02 





52.70 



49.92 















3 



a 



g 

 



a 

 S 



an 







B 



1 



3 

 a 



1 



1 



3 



1 



g 

 



i 



i 



a 

 a 







Latitude 



37° 22' 



108° 05' 



8.633 



390 58' 



107° 48' 



6,491 



21.8 

 26.2 

 28.6 

 41.0 

 54.7 

 64.4 

 63.9 

 64.8 

 58.3 

 49.0 

 35.8 

 26.8 



38° 12' 



106° 50' 



9,290 



390 00' 

 106° 00' 

 10, 783 



17.86 

 24.45 

 19.78 

 29.75 

 41.28 



390 44' 



105° 13' 



5,729 



"4P."77' 

 61.00 

 67.57 

 73.33 

 74.73 

 65.80 



37° 32' 



105° 40' 



7,945 



18.46 

 23.37 

 33.63 

 42.75 

 52. 41 

 62.23 

 66.61 

 64.34 

 55. 61 

 43.97 

 30.88 

 20.05 



39° 48' 



105° 30' 



8,300 



24.05 



"38.'53 

 49.27 

 62. 73 

 67.90 



"56.'33 



"ss.'ss 



37. 30 



38° 50' 

 105° 02' 

 14, 147 



2.1 



4.5 



4.5 



14.9 



21.4 



31.0 



3J.7 



35.9 



32.1 



25.0 



10.8 



9.7 



19.0 



39° 21' 



Longitude 



106° 06' 

 14, 200 





6.0 























■* 















""55.'8 

 46.2 





45.0 







43.0 







36.0 







28.0 













18.0 









19,58 





15.0 













44.6 









42.86 



















