MADE AT BRUNSWICK, MAINE. 



33 



These results are laid down in the following diagram :- 



Annual fluctuation of the temperature. 



68° 





















'~~ 



■^ 









— 



fifl 















/ 



"N 















64 















/ 

















fiS 















/ 

















60 































fiR 































he, 





















\ 











u 





















\ 











t>9. 





















A 











KO 





















\ 











4S 





















^ 











40 























\ 









44- 



























\ 









4S 























\ 









40 









/ 















\ 









SS 









/ 















\ 









3(i 









/ 















> 









M 









/ 























S2 









/ 























SO 































28 































26 































«4 































?.S 





/ 























\ 





20 





/ 























\ 



































1-5 



ft 



a 





^1 





1 



i 



a. 



c 



1 



O 



1^ 





On the average, from 52 years of observations, the hottest day^ falls on July 22d, 

 or 31 days after the summer solstice, temperature + 67°.7; the coldest day falls 

 on January 18th, or 28 days after the winter solstice, temperature + 19°. 9 Fahr. 

 The days when the average annual temperature is reached are April 20th and 

 October 24th. 



Table V contains the observed greatest and least monthly mean values from the 

 whole series of observations, taken from Table I and corrected for diurnal fluctuation. 



Table V. — Observed Extremes Monthly Means. 





Least. 



(Jreatest. 



Range. 



Least. 



Greatest. 



Range. 



January .... 



February 



March .... 



April .... 



May .... 



June .... 



+11°.72 

 14.72 

 23.83 

 36.33 

 46.53 

 55.80 



+35°.22 

 36.92 

 40.92 

 51.19 

 61.01 

 71.78 



23°.50 

 22.20 

 17.09 

 14 87 

 14.48 

 15.98 



July . . 



August .... 



September 



October .... 



November 



December 



+59°.63 

 60.85 

 52.33 

 40.18 

 27.69 

 15.52 



+76°.15 

 73.96 

 65.80 

 55.07 

 45.03 

 36.98 



16°.52 

 13.11 

 13.47 

 14.89 

 17.34 

 21.46 



The figures in the last column show quite plainly the general law of a greater 

 variability in the temperature during the winter than during summer. In the cold- 



' Maxima and minima are most conveniently computed by the formula = 23. 15 cos (9 + 248° 45') 

 + 1.76 cos (29 + 258°) + 2.37 cos (39 + 225°) + 0.44 cos (49 + 333°) obtained by differentiating 

 he formula in the text. 



April, 1867. 



