Jan., 1903.] Some Climatic Conditions of Ohio. 341 



Maximum Monthi^y Precipitation. 



Another phase of the subject of precipitation which is of some 

 importance ecologically is that of the maximum and mininuuu 

 nionthl}- precipitation. The records here again indicate very 

 interesting differences in the state. Throughout the southwestern 

 part of Ohio March is the wettest month of the year. The range 

 was from 5.69 in. at Cincinnati to 9.02 in. at Portsmouth for the 

 region having the maximum precipitation in March. With the 

 exception of Milligan, with a maximum of 6.64 inches in June, 

 the remainder of the state has its rainiest season in July with 

 maxima ranging from 4.63 inches at Cleveland to 6.95 inches at 

 Ashtabula. 



Minimum Monthly Precipitation. 



For the minimum monthh- precipitation fourteen of the fifteen 

 stations report October, the range being from 0.85 inches at 

 Clark.sville to 1.29 inches at Ashtabula. The one station not 

 agreeing with the above was Sandusk}' with a minimum of 0.95 

 inches in December. 



Rainy Days. (Plate III Map III.) 



The region bordering Lake Erie, as might be suspected, leads 

 the state in the total number of rainy (or snowy ) days per year. 

 Cleveland has precipitation 150 da3\s in the year, while in the 

 extreme northwestern and in the southeastern part of the state 

 the number falls to below 100. 



Clear Days Per Year. (Plate III Map IV.) 



Sandusky reports the least number of clear days ( 69 ) while 

 Ashtabula reports the greatest number, — over 160. Just why 

 this should be is rather difficult to say. It was thought that 

 perhaps some of the difference might be due to the shortness of 

 record at Ashtabula (6 years) or to a lack of uniformity in sky 

 observations at different stations, but the examination of the 

 records of neighboring stations seemed to confirm the reliability 

 of A.shtabula's records as averages of that locality-. 



Cloudy Days. 



The number of cloudy days follows about the same order as 

 the rainy days. A strip running south and west from Sandusk\- 

 to Cincinnati through the central part of the state, includes the 

 region having the greatest number of cloudy days. Sandusky 

 leads with 169 per year. 



