INTRODUCTION. 



21 



Cincinnati, Ohio. Lat. 39^6', alt. 620.42 feet. 



Mean annual temperature (8 years) 55~3. 



Total annual rainfall (8 years) 42.39 inches. 



Baltimore, Md Lat. 39 28', alt. 45.19 fc-t. 



Mean annual temperature (8 years) 55~5. 



Total annual rainfall (8 years) 42.46 feet. 



St. Louis, Mo. Lat. 38S7', alt, 567.67 feet. 



Mean annual temperature (8 years) 55 5. 



Total annual rainfall (8 years) 39.67 inches. 



Washington, D. C. Lat. 3s 53', alt. 105.56 feet. 



Mean annual temperature (9 years) 551. 



Total annual rainfnll (9 years) , 42.73 inches. 



II. Comparative mean monthly and annual temperature and rainfall 

 at Cairo, Illinois, flat. 370', alt. 377.35 ftj and Norfolk, Virginia 

 flat. 36*51', alt. 54.50 ft J, for 10 years. 



Maximum Mean Annual Temperature for 10 Years. 



_- i i ' i e- r*" Li rtT *"' "^ ^ 



< 03 "O p , C 



~i "1 >5 v^ K 



* g ? r I f ; I I | | i 



2 ;_. rs o- cr 



BO- :r % 



("^airo ... 

 Norfolk. 



187839.8 

 1870 47.7 



44. 7 57. 8 04. 3 

 45. 0.46. S 55.3 



C8.1 

 65.7 



73. P S2.7 

 78.181.7 



81.270.fi 



78.209.7 



50 

 50.8 



050 



.1 33.2 

 49.433.0 



59.02 

 58. '.U 



Minimum Mean Annual Temperature for 10 Years. 



Cairo . . . 



Norfolk. 



1875'28.332.9 



187235.037.0 



44.8 



39.0 



54.8 



65.8 



57.0 



08.0 



74.2 



78.973.007.5 



81.079.072.658.9 



55.2 



45.9 

 40.2 



45 

 36.8 



55.62 



57.20 



Average Mean Annual Temperature for 8 Years. 



Cairo 



Norfolk 



57.9 



58.7 



Mean Annual Rainfall for 10 Years. 



o 



r-f- 



P 



airo 



Norfolk.. 



2.97 

 3.50 



3.05 



4.39 

 4.21 



4.31 

 3. 



9s :> 



3.804.643.33 

 27 4.02 



5.306.364.91 



3.02 

 3.09 



063 



>:\ I 



42 

 .3tJ 



42.8:5 

 50.54 



*The comparative rainfall of the two localities, as given in tlie report of the Chief 

 Signal Officer for 1880, is as follows: 



Cairo, 8 years, (1871-79) 45.09 inches. 



Norfolk ., , 53.s:{ 



