16S 



THE CLIMATE OF ST. MARY S COUNTY 



The extremes of temperature are slightl}' greater in this section of 

 the country than farther south. It is to be observed that a comparison 

 of the extremes at Baltimore and at most co-operative stations is scientifi- 

 cally not admissible; the thermometers at Baltimore are placed 80 feet 

 above the ground, while at nearly all co-operative stations they are at 

 an average elevation of about 5 feet. The extremes both of summer 

 heat and winter cold are diminished with elevation above the earth's 

 surface, although the mean temperature between .5 and 60 feet will 



Ndmeer of Times Maximum Tempeeatuees was above 90° and Minimum below 32 

 AT Charlotte Hall, Md. 



hardly vary a tenth of a degree (Hann). On clear, cold nights the 

 temperature at 5 feet elevation may be from 5° to 10° lower than it is 

 at 80 feet. The minimum temperatures in winter are lower at co- 

 operative stations than would appear to be correct if corapiarison be made 

 with the temperatures recorded at Baltimore. 



During the past few years the range of extremes at Charlotte Hall, 

 in common with most other stations in Maryland has been quite remark- 

 able. The summer of 1900 was one of extraordinary warmth throughout 

 the eastern United States, while the preceding February (1899) was 

 extremely cold. During the warm wave of August, 1900, the maximum 

 at Charlotte Hall reached 103°, on the 11th; while during the cold wave 

 of February, 1899, the lowest temperature was 19° below zero, the 

 ground being covered with snow. During this cold wave the lowest tem- 



