178 THE CLIMATE OF CALVERT COUNTY 



of the Maryland State Weather Service observations were begun at 

 Solomons by Dr. William Henry Marsh in January, 1892, and have been 

 continuous since that date. The latitude of the station is 38° 19' X., 

 longitude 76° 27' W., and elevation about 20 feet above sea level The 

 series of observations by Dr. Marsh are admirable in every respect, and 

 must long serve as the criterion for the comparison of other records in 

 southern Maryland. By his faithful persistence during a period of 14 

 years Dr. Marsh has performed a highly commendable service in the 

 interest of science. It is proposed to publish the record for Solomons in 

 as complete a form as possible. 



In order, however, to obtain approximately correct mean values of 

 temperature and precipitation for the county at large, recourse must be 

 had to the data of neighboring stations. The means for the county may 

 be obtained with a close approach to accuracy by making use of the fol- 

 lowing records: Solomons (length of record 14 years) at the southern 

 extremity of the county, Cambridge (7 years) east of Chesapeake Bay in 

 Dorchester County, about the same latitude as Prince Frederick, Jewell 

 (15 years) at the northern border in Anne Arundel County, and 

 Charlotte Hall (9 years) west of the central portion of the county in 

 St. Mary's County. 



Temperature Conditions. 



The average temperature conditions for Calvert County are given in 

 Table III. The first portion of the table gives the actual means and 

 extremes at all stations; as the periods of observation are relatively 

 short, it would not be correct to assume that any of the records give true 

 normals of temperature. A correction has therefore been applied to 

 each station, the amount of which was determined by comparison with 

 the Baltimore record for 88 years from 1817 to 1905. The averages of 

 the corrected means for Cambridge, Charlotte Hall, Jewell, and Solo- 

 mons may be considered to give a fairly accurate normal mean tempera- 

 ture for Calvert County. 



