APPENDIX. 



53 



BaTomeirie monthly extremes. 















































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.52 

 .48 

 .44 

 .40 



.36' ^. 

 29.32 -g 

 .28 S 

 .24 

 .20 

 .16 

 .12 



The barometric maxima reach their greatest value (30.46 inches) in December, and their least 

 value (30.14) in June; the barometric minima reach their highest value (29.50) in August, and their 

 lowest value (29.11) in January and February. These epochs, it will be noticed, correspond to the 

 times of the extreme values of the temperature in its annual variation. 



The regularity in the annual progression of the barometric monthly extremes is further exhibited 

 by the following values of the average monthly means (mean of highest and lowest readings), and 

 of the monthly range. 





Average. 



Range. 





Average. 



Eange. 



January 



29'".78 



1'°.34 



July .... 



29i"'.81 



0!'».67 



February- 



.77 



1.32 



August 



.84 



0.68 



March .... 



.80 



1.19 



September . 



.84 



0.85 



April .... 



.80 



1.05 



October 



.86 



1.02 



May .... 



.79 



0.89 



November . 



.83 



1.18 



June .... 



.78 



0.73 



December . 



.79 



1.34 



The average pressure for the-year'is 29.81 inches, which is probably very near the mean value of 

 the atmospheric pressure at Brunswick; reduced to the sea level it becomes 29.90 inches. 



The monthly range of the greatest and lowest value is a maximum (1.34 inches) at the period of 

 the greatest cold, and a minimum (0.67 inches) at the period of the greatest heat of the year. It 

 appears that the range in January is just double that of July. 



PUBLISHED BY THE SMITHSONIAN INSTITUTION, 

 WASHIN'GTON CITY, 



MAT, 1867. 



