MARYLAND GEOLOGICAL SURVEY 195 



cate, as stated by Dr. Fassig in his account of the climate of Garrett 

 County (page 264), that "the liot wave of August, 1900, was most 

 intense near the earth's surface below the mountain tops." During the 

 period of most intense heat the winds at Solomons were light north- 

 westerly, 6th to 12th, and when a shift to south and southeast took place, 

 there was an immediate decline in temperature. 



Frequency and Duration of Cold Periods. 



The minimum temperature falls below the freezing point on the aver- 

 age 68 times a year. In the cold year, 1904, the minimum was below 33° 

 87 times, while in 1894 it was below freezing only 46 times. Freezing 

 temperatures occur on the average 4 times in November, 15 times in 

 December, 21 times in January, 19 times in February, 8 times in March, 

 and 1 time in April. Of course these figures indicate a far less fre- 

 quency of freezing temperatures in Calvert County than in the moun- 

 tainous section of the State. In Garrett County freezing weather occurs 

 at one time or another in every month of the year, and the average num- 

 ber of days with a minimum of 32° or less for that county is 160; here 

 the frequency has varied from a minimum of 140 times at Grantsville 

 in 1897 to a maximum of 187 times at Deer Park in 1895. 



The following table gives, the dates on which the temperature fell to 

 20° or below at Solomons: 



1892.— January 4, 16, 17, 23, 27; February 6, 13, 17, 18; December 25. 



1893.— January 10, 11, 13, 14, 15, 16, 17, IS, 21, 22; February 5, 20, 21; March 5. 



1894.— February 5, 24, 25; December 29, 30. 



1895.— January 1, 2, 5, 13, 14, 25; February 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 



15, 17, 18, 23; December 14. 



189C.— January 4, 5, 6, 7; February 17, IS, 20, 21, 22; March 14; December 24, 



25, 28. 

 1897.— January 25, 26, 27, 28, 29, 30, 31; February 1; December 24, 25. 

 1898. — January 2; February 1, 2, 3, 4; December 14, 15. 

 1899.— January 1, 2, 11, 29; February ]. 2, 8, 9, 10, 11, 12, 13. 14. 15, 16; 



December 27, 28, 29, 30, 31. 

 1900.— January 1, 2, 3, 4, 27, 29, 30, 31; February 1, 2, 18, 19, 20, 25, 26, 27; 



March 12, 18; December 15, 17. 

 1901.— January 19, 20; February 1, 6, 7, 13, 14, 23, 24; March 6, 7; December 6. 



16, 17, 18, 19, 20, 21, 22. 



