8 BULLETIN 339, U. S. DEPARTMENT OP AGRICULTURE. 



ranges from about 10 to 14 inches per annum, of which from as 

 low as 3 inches to as high as 6.7 inches, or about one-third, occur 

 during the growing season from April to September, inclusive. 



The growing season of 1910 in Idaho was the driest on record. 

 The precipitation during seven consecutive months, from March to 

 September, inclusive, was below normal, but the temperature ranged 

 alcove normal during the entire season. The seasons of 1911 and 

 1912 averaged much cooler than that of 1910, but the precipitation 

 during both of these years ranged above normal during the entire 

 growing season, as may be seen from the tables which follow. The 

 season of 1913 was another with high precipitation, while the tem- 

 perature was a fair average of the other three years, 1910 to 1912, 

 inclusive. The following tables and charts have been compiled from 

 the records of the United States Weather Bureau for the purpose 

 of showing in condensed form the weather conditions that existed 

 during the four years covered by the investigation. Figure 1 shows 

 the precipitation for one town in each district and figure 2 the range 

 of temperature during the growing season for three representative 

 districts, and it is believed that a careful study of these charts will 

 furnish a correct idea of Idaho's normal weather conditions and of 

 the weather experienced during the four years' investigations. 



Table I. — Precipitation, seasons of 1910, 1911, 1912, and 1913. 



SEASON OF 1910. 



Locality. 



Length 



of 

 record 



in 

 years. 



Average 

 precipitation . 



Precipitation by months. 



Total 



for 6 



months. 



Per 

 cent 



An- 

 nual. 



Apr. to 

 Sept. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



of nor- 

 mal. 



Blackfoot 



14 

 25 

 3 

 5 

 1 

 8 

 15 

 3 

 5 



Inches . 

 10.46 

 12.71 

 12.22 

 10.54 



Inches . 

 4.84 

 4.10 

 5.13 

 3.51 



Inches . 



0.67 



1.10 



.82 



1.05 



.77 



.81 



.06 



.33 



.73 



Inches. 

 0.78 

 1.14 



.55 

 .84 

 .32 

 .80 

 .75 

 .43 

 .52 



Inches . 

 0.10 

 .30 

 .25 

 .03 

 .08 

 .06 

 .14 

 .01 

 .06 



Inches . 



0.21 



T. 

 .28 



T. 

 .24 

 .27 

 .11 

 .18 

 .12 



Inches . 



T. 

 

 

 

 

 



T. 

 



T. 



Inches . 



0.47 



.50 



Inches. 

 2.23 

 3.04 



46 

 74 



Buhl. . 





Caldwell 



.89 



.44 



1.33 



1.30 



.54 

 .95 



2.81 

 1.85 

 3.27 

 2.36 

 1.49 

 2.38 



80 









17.15 

 14.45 

 15.06 

 12.90 



4.04 

 6.24 

 2.91 

 4.40 



81 





38 





51 



Twin Falls 



54 







SEASON OF 1911. 



Boise 



Buhl 



Caldwell... 



Gooding 



Hailey 



Idaho Falls. 



Oakley 



Twin Falls. 

 Wendell.... 



26 



12.71 



4.10 



1.59 



2.57 



2.55 



0.05 



T. 



0.04 



6.80 



4 



11.15 



5.17 



.86 



1.97 



2.34 



.18 



T. 



T. 



5.35 



6 



10.31 



3.59 



1.03 



1.13 



1.44 



.23 



T. 



.12 



3.95 



2 



9.40 



3.20 



1.15 



1.77 



1.06 











T. 



3.98 



9 



16.27 



4.30 



1.67 



2.91 



1.53 



0.04 



" T. 



.03 



6.18 



16 



14.00 



6.00 



.95 



2.29 



2.67 



.30 



0.07 



.67 



6.95 



18 



9.58 



4.61 



.15 



1.75 



2.76 



.84 







.30 



5.80 



6 



12.10 



4.19 



.43 



1.74 



.83 



.05 



0.O4 



.10 



3.19 



3 



13.86 



3.96 



1.35 



2.00 



1.95 



T. 







T. 



5.30 



166 

 103 

 110 

 124 

 144 

 116 

 126 

 76 

 134 



