MAMMALS OF MARYLAND 



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FiGUBE 1. — ^Map of Maryland showing the 23 counties, Baltimore City, and the 



District of Columbia. 



TEMPERATURE 



The mean annual temperature for Maryland is 53 to 54 degrees. It 

 varies from area to area, the greatest difference being between Worces- 

 ter County on the Eastern Shore and Garrett County in the Alle- 

 gheny Mountains: according to Shreve et al. (1910), the average an- 

 nual temperature at Sunnyside in Garrett County is 47.1 degrees, 

 whereas at Pocomoke City in Worcester County it is 58, a difference 

 of 11 degrees. At intermediate points the average annual temperatures 

 are also intermediate ; the differences that exist are due to such factors 

 as elevation and proximity to the ocean and Chesapeake Bay. The 

 average date for the last killing frost in spring in western Maryland 

 is the first week in May; farther east it is the last 10 days of April. 

 In western Maryland the average time for the first killing frost in 

 autumn is late September; in the eastern part of the State it is early 

 November. 



AVERAGE ANNUAL 

 PRECIPITATION 



Precipitation is distributed throughout the year, but with a some- 

 what greater amount in the warmer months than in the cold season. 

 The heaviest rainfall, from 38 to 46 inches, occurs in western Maryland. 



