200 



TABLES AND RESULTS OF THE PRECIPITATION 



Type III. — Upper Mississippi River, from Fort Madison, southern Iowa, to Fort RiiAey, central 

 Minnesota, and including part of Wisconsin. 



Characteristics : A principal maximum about the end of June, a secondary maximum about the middle of Sep- 

 tember, and a principal minimum about the beginning of February. Range, tolerably large. 



Months. 



>i 



c 



ars. 



ukee, 

 ars. 



I ,A 



i^ 



Mean 



















1" t 





1- 



Stations. 



January 



•34 



.41 



6s 



62 



SI 



•57 



•52 



February 



■3° 



■25 



S3 



S5 



69 



•77 



•SI 



March 



.64 



•58 



76 



78 



88 



.86 



•75 



April 



•77 



I. II 



83 I 



08 I 



21 



1.08 



1. 01 



May 



1-39 



1.42 1 



32 I 



29 I 



2S 



1.23 



1.32 



June 



2.00 



1-73 I 



64 I 



40 I 



34 



1.25 



i^56 



July 



1.90 



1.74 I 



45 I 



5i I 



OS 



1.24 



1-45 



August 



1-31 



1.42 I 



06 I 



08 I 



48 



1.23 



1.26 



September 



1.66 



1.63 I 



38 I 



28 I 



13 



^•35 



1.40 



October 



.68 



.63 I 



II 



9Z 



9S 



.91 



.87 



November 



.68 



■71 



76 



94 



81 



.78 



•78 



December 



•34 



•39 



5° 



76 



71 



•71 



•57 



The curve is derived, on the aggregate, from 114 years of observation; it does 

 not materially differ from that of Type II; the maximum in October appears now 

 shifted into September, and the whole range of the variation is increased. Com- 

 paring the curves individually, there is a tendency to a single maximum, the earlier 

 of the two ; at one station they appeared to merge into one, and at another, the later 

 maximum is higher than the earlier one. More observations are required to render 

 this type more perfect. 



Type IV. — Ohio River Vallcij ; fronh Alleghany Arsenal, western Peiinsylcania, to St. Louis, 

 eastern Missouri. 



Characteristics: One principal maximum, and one principal minimum ; the former early in June, the latter early 

 in February. Range, moderate. 



Month. 



5! ^ -i 





•If 



ncinnati, 

 I years. 





6 years. 

 Louis 



% ^ 



11 

 3 ^ 



c 1 s" ^ 



lean 

 itions. 



< 







!•*• 



■c^ & 



" < 



" ifi 





if: " 





74 



January 



7° 



85 



.82 



.82 



90 



76 



S6 



•59 



.67 



February 



73 



79 



.86 



•85 



93 



67 



63 



•73 



•63 



76 



March 



88 



98 



.90 



.98 



97 



78 I 



09 



1.07 



.88 



95 



April I 



07 I 



02 



•99 



.98 



97 I 



25 I 



14 



1. 10 



.92 I 



OS 



May I 



25 I 



II 



1. 16 



1. 17 I 



23 I 



47 I 



39 



1-37 



1^37 1 



28 



June I 



31 I 



16 



1.22 



1.20 I 



22 I 



73 I 



82 



1.48 



1.46 I 



40 



July I 



04 I 



12 



1.25 



I. 12 I 



10 I 



02 I 



14 



I. II 



1.40 I 



14 



August I 



14 I 



IS 



I. IX 



I. 13 I 



04 



90 



98 



I. II 



1. 13 I 



08 



September 



90 I 



01 



.88 



.90 



73 



99 



69 



.88 



.96 



88 



October 



95 



92 



.92 



.88 



84 



76 



90 



.87 



■91 



88 



November 



93 



91 



.89 



.91 



94 



84 



91 



•83 



•95 



90 



December i 



09 



97 



1. 01 



1.06 I 



13 



84 



76 



.86 



■V- 



94 



The Typo-curve IV is derived, on the aggregate, from 2-49 years of observation. 

 The individual curves show considerable deviations in the time of the principal 

 maximum and in the amount of the secondary maximum. 



