INTKODUCTION. 



21 



Cincinnati, 07iio.— Lat. 39-6', alt. 620.42 feet. 



Mean annual temperature (8 years) 5o°3. 



Total annual rainfall (8 years) 42.39 inches. 



Baltimore, Md.—Lat. 39=28', alt. 45.19 feet. 



Mean annual temperature (8 years) 5o'5. 



Total annual rainfall (8 years) 42.46 feet. 



St. Louis, Mo.— Lat. 38^37', alt. 567.67 feet. 



Mean annual temperature (8 years) 55=5. 



Total annual rainfall (8 years) « 39.67 inches. 



Washington, D. C— Lat. 38=53', alt. 105.56 feet. 



Mean annual temperature (9 years) 55°1. 



Total annual rainfull (9 years) 42.73 inches. 



n. Comparative mean monthly and annual temperature and rainfall 

 at Cairo, Illinois, flat. 37°0', alt. 3?7.35 ft. J and Norfolk, Virginia 

 Clat. 36^51', alt. 54.50 ft.) , for 10 -years. 



Maximum Mean Annual Temperature for 10 Years. 



Minimu7n Mean Annual Temperature for 10 Years. 



Cairo 1875 28.3 32.9 44.8 54.8 



Norfolk 1872 35.0 37. 0j39. 57.0 



65. S 

 68.0 



74.2178.9 ~3.6!67.5l.W.2f45.9 45-6 55.62 

 76. 81. 0;79. 72.6158. 9,46. 2 36. 8 57.20 



I I I I I I I 



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



Signal OfBcer for 1880, is as follows:— 



Cairo. 8 years. (1S71-79) 45.09 inches. 



Norfolk ., 53.83 



