MADE AT BRUNSWICK, MAINE. 



35 



Relation hetween Temperature and the Direction of the Wind. 

 The method of reduction is briefly as follows: By means of the formula {T) the 

 temperature for each day of the year was computed and referred to the mean of 

 three daily observations, as recorded, by applying the correction for diurnal fluctua- 

 tion with the sign reversed. The temperature thus computed was subtracted from 

 the observed temperature of each day during which the wind has not changed its 

 direction ; a + sign indicates an elevating, a — sign a depressing efiect. Separate 

 entries were made for each season and for each of the eight principal directions of 

 the wind. It was not possible to secure a sufficient number of observations for some 

 of the cardinal points ; for these we must content ourselves with annual mean results. 

 1128 observations (days) were employed in bringing out the following tabular 

 results •} — 



Effect of the Direction of the Wind upon the Temperature in Different Seasons, and | 







FOR THE Year. 



1 



Direction. 



Winter. 



Spring. 



Summer. 



Antnmn. 



Tear. 



N 



— 1°.6 



(-2".5) 



(-4°. 2) 



— 7°.0 



-3°.l 



N. E 



—2.4 



—6.5 



(-7.8) 



—2.3 



—3.8 



B 



+ -- 









(+2.2) 







S. E 



+ -- 



—2.9 



—5.9 



(+5.4) 







S 



+ -- 



+ -- 



(-0.6) 



+ -- 



+2.4 



S. W. ... 



+5.3 



+2.2 



—1.5 



+4.5 



+2.6 



w 



—1.1 



—0.7 



+2.9 



+1.8 



+0.7 



N. W. . . . 



—5.7 



—6.2 



—2.3 



—4.2 



—4.6 



The most permanent and conspicuous effect upon the temperature, at all seasons, 

 is that of the N. W. wind, its depressing influence is 4°. 6 Fahr. on the average. 

 N. and N. E. winds likewise lower the temperature throughout the year by 3°.l 

 and 3°. 8, respectively. The S. W. wind, on the contrary, elevates the temperature 

 above its normal value ; its annual mean effect is 2°.6. During summer, however, 

 this same wind slightly depresses the temperature. S. and W. winds, upon the 

 yearly average, also elevate the temperature, though their effect may be different 

 in different seasons. 



Relation hetween Temperature and Summer Rains. 



If w'e compare the mean daily temperature on rainy days (days with three 

 entries of rain, or at least two entries of rain and one of fog or haze), with their 

 respective normal temperature, we sliall find a marked effect during the summer 

 months (June, July, and August). On 87 days of comparison the temperature was 

 almost invariably lower, the average amount of depression being 6°. 5 Fahr. 



Relation hetween Temperature and Precipitation in Winter. 



During winter we find the effect reversed ; on 283 days of either snow, sleet, or 

 rain, during December, January, and February, the temperature was found higher 

 than the normal value, on the average by 4°. 3 Fahr. During rainy days in winter. 



* Figures within brackets depend upon a small number of observations. 



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