PART III.— METEOROLOGY. 



METEOROLOGICAL REGISTER 



FOR THE YEAR 1822; 



Exhihiting the daily mean temperature of the iveaiher from 

 observations taken at several of the military posts of the 

 United States, by Joseph Lovell, M. D. Si'.rgeon General 

 of the United States^ Army. 



The following tables are abstracts of meteorological obser- 

 vations taken at eight of the military posts of the Atlantic 

 coast, extending from Eastport in Maine, to Fort St. Philip 

 near New Orleans; at one on the Mississippi, above New 

 Orleans; and at seven on the north western frontier, from 

 Council Bluffs on the Missouri, to Fort Niagara on Lake 

 Ontario; embracing an extent of 16° 22' of latitude, and 28° 

 39' of longitude. To these' have been added, as a standard 

 of comparison, observations taken during the same year near 

 the city of Philadelphia. 



It will be perceived that Eastport, Portland, Fort Consti- 

 tution near Portsmouth, and Newport, are respectively in 

 about thesanie latitude as Fort St. Anthony, Green Bay, Prairie 

 du Chien, an^§Council Bluffs ; while the average difference of 

 longitude is 21° 39'. On comparing the observations taken in 

 these two sections of the country, the most remarkable differ- 

 ence will be found to consist in the extreme cold of the winter 

 and the proportionate warmth of the summer at the Western, 

 and the comparative equable temperature at the Eastern 

 Posts. In January, which is the coldest month, the thermometer 

 stood at - 25° at Fort St. Anthony ; - 23° at Green Bay ; - 19° 

 at Prairie du Chien, and - 16° at Council Bluffs. The mean 

 for the month at the first place was 11.68; at the second I3.2O5 



