20 RESULTS OF METEOROLOGICAL OBSERVATIONS 



These extreme means are shown in diagram (B). 



Diagram B. 



78° 

 74 

 70 

 66 



/ 



/ 



/ 



\ 

 \ 



\ 



\ 



I 

 \ 



62 







1 \ 



\ 



58 



/ 





1 \ 



1 \ 





\ 



54 



/ 



1 \ 



\ 



50 



/ 





1 





- 



46 





/ 





1 ^ 

 1 





\ 



42 



- 



y 







\ 





X 



- 



38 



- 







/ 







- 



34 



- 







/ 1 

 / 







- 



30 



- 







\ 





- 



26 



- 









- 



22 







/ ' 





- 



18 



L- 



^^ 



- 



The irregularity in the daily mean temperature is further illustrated by the fol- 

 lowing table of observed extremes for each month during 31 years. 





Lowest. 



Highest. 





Lowest. 



Highest 



January 



. — 6°.6 



60°.8 



July . 



. +55°.5 



86°.2 



February 



. — 4.3 



61.8 



August . 



. +53.9 



84.0 



March . 



. + 9.5 



74.0 



September 



. +42-2 



80.9 



April 



. +25.6 



76.6 



October 



. +28.8 



75.4 



May , 



. +42.4 



82.3 



November 



. +16.4 



66.7 



June 



. +45.9 



88.7 



December 



. + 3.4 



64.4 



The above numbers are corrected for diurnal fluctuation. 



The extreme lowest temperature observed was — 23°.0 at 7 A. M. January 20th, 

 1852, and the extreme highest 102°.0 at 3 P. M. July 14th, 1859. Extreme range 

 observed 125° of Fahrenheit's scale. 



Annual Fluctuation of the Temperature. 



The monthly means at the bottom of Table III require a small correction to 

 refer them from calendar to average months ; this correction has been effected in 

 the same manner as in my discussion of the Brunswick observations.^ The cor- 

 rections and corrected monthly means are as follows : — 



* The rnle given for complete quadriennia is as follows: Cast into February .56 of the last of 

 January ; include with February the first and .62 of the second of March ; with March the first of 

 April and .06 of the second; with April the first and half of the second of May; with May .94 of 

 the first of June ; with June the first and .37 of the second of July ; with July .81 of the first of 



