174 



THE CLIMATE OF ST. JMAEY S COUNTY 



The precipitation for the interior of St. Mary's County may be ex- 

 pected to be somewhat smaller than the average for the county, and the 

 record for Charlotte Hall may be accepted as fairly correct as a whole. 

 The annual total for 9 years is 36.79 inches. The complete record for 

 Solomons gives 39.05 inches. The station has not received a total of 

 10.00 during any month, the maximum record being 7.08 inches in 

 April, 1901. Amounts less than 1.00 incli are not uncommon. The 

 smallest total was 0.10 inch in February, 1901. 



TABLE xxin. 

 Monthly and AxNu.iL Snowfall (unmelted) at Charlotte Hall, Md. 



The largest average rainfall is found in July, when the normal is 

 4.09 inches, or 11 per cent of the annual total; the least occurs in 

 November, with but 5 per cent of the annual amount. 



The record of average, maximum and minimum precipitation is shown 

 graphically in Fig. 12. 



Excessive precipitation is even less frequent in the interior of this 

 region than along the coast. At Cliarlotte Hall a fall exceeding 2. .50 

 inches in 24 hours has been recorded in February, 1899 (3.00 inches), 

 in April, 1895 (3.G7 inches), in June, 1900 (2.56 inches), in July, 

 1900 (2.72 inches), and in December, 1894 (3.00 inches). Heavier 

 rains for brief periods were not recorded. 



The following were the longest periods of consecutive rainy days: 



