418 APPENDIX. 



at the third 14.86 ; and at the fourth 21.02. In the same month 

 the lowest degree at Eastport was - 9° ; at Portland - 10°; at 

 Fort Constitution - 7°; and at Newport 0. The mean for 

 the month at the first place was 17.53 ; at the second 17.63 ; 

 at the third 20.50 ; and at the fourth 26.54. Thus at the west 

 the lowest degree on an average of four observations was - 

 20.75, and the mean for the month 15.79, while at the East 

 the average lowest degree was - 6.50, and the mean for the 

 month 20.55, making the difference for the month 4.76. 



In July, which is the hottest month, the weather was pro- 

 portionately warm at the west. Thus the highest degree, on 

 our average of four observations, is 96° ; and the mean for the 

 month 75.31, while at the east the highest degree is 83 and 

 the mean for the month 68.82 ; making a difference of 6.49. 

 The mean for the year at the four western posts is 46.04; and 

 at the four eastern 47.23, a difference of 1.19 only. 



The centre of these sixteen stations lies between Norfolk 

 and Annapolis; taking therefore these two posts, and the three 

 northern and the three southern ones, which are respectively 

 about equidistant from this centre, it will give 53.91 as the 

 mean temperature for the year throughout the country; which 

 is about the same as that of Detroit in Michigan Territory. 



The difference in the range of the thermometer was 27" ; 

 it being 133° at the west, and 106 at the east. At the most 

 southern station it was but 43°. The result of forty-eight 

 monthly observations of the course of the winds at the western 

 posts is N. W. 20— S. W. 17— N. 5— N. E. 2^. E. 2— W. 

 1— S. 1. At the east ; N. W. 14— S. W. 14— S. 11— S. E. 3 

 __N. 3— W. 2— N. E. 1. The N. W. and S. W. are there- 

 fore decidedly the prevailing winds, being in the proportion 

 of 65 to 31 ; and it is remarkable that the proportion of S. W. 

 winds in the summer; and of N. W. winds in the winter at 

 the western is exactly the same as at the Eastern Posts. 



At the west the proportion of fair weather to cloudy is as 

 17 to 7; and at the east as 11 to 1. The proportion of fair 

 weather at the east is to that at the west, as 4 to 3, nearly. 



