INTRODUCTION. 



21 



Cincinnati, Ohio. Lat. 896', alt. 620.42 feet. 



Mean annual temperature (8 years) 558. 



Total annual rainfall (8 years) 42.39 inches. 



Baltimore, Md.Lat. 3928', alt. 45.19 feet. 



Mean annual temperature (8 years) 555. 



Total annual rainfall (8 years) 42.46 feet. 



St. Louis, Mo. Lat. 3837', alt. 567.G7 feet. 



Mean annual temperature (8 years) 555. 



Total annual rainfall (8 years) 39.67 inches. 



Washington, D. C. Lat, 3853', alt. 105.56 feet. 



Mean annual temperature (9 years) 551. 



Total annual rainfull (9 years) 42.73 inches. 



II. Comparative mean monthly and annual temperature and rainfall 

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

 flat. 3651', alt. 54.50 ftj, for 10 years. 



Maximum Mean Annual Temperature for 10 Years. 



i I 



IIM | i 



Cairo.... 1187839.844.757.864.368.1 73 982.781.270.659 05<U 33.2 59.62 



Norfolk 187647.745.0.46.555.365.778.181.778.269.756.849.433.6 



Minimum Mean Annual Temperature for 10 Years. 



Cairo... ... 1875 28.3'32.9 44.8 54. 8 65.8 74.2 78.9,73.6 67.5 55 245 945 6 5562 



Norfolk 1872 35.0 37.0 39.0 57. 068. 076.0 81.0 7s.u 72 658.946.236.8 67.J 



Average Mean Annual Temperature for 8 Years. 



Cairo. 67.9 



Norfolk 68.7 



Mean Annual Rainfall for 10 Ytars. 



Cairo.... ...2.S7 3. W 4.39 4.31 3.80 4.64 3.33)2. 88L61J3.02 4. 06|8.42 42.83 



Norfolk 3.503.054.213.983 27 4.02 5.36 6.36|4.9l|3.693.8SJ4.3t> 50.64 



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

 Signal Officer for 1880. is as follows: 



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

 orfolk .. 53.83 " 



