NO. 17.] 



TEMPERATURE OF THE AIR. 



495 



As a rule, the coldest winds come from the north to east quadrant, 

 and the warmest winds from the opposite quadrant, south to west. The 

 difference between the warmest and the coldest wind is least in the summer 

 months, being only 0'°7 in July, and greatest in March and November 

 (PI. VT. 1 mm. = r C). 



The southerly winds being the warmest, and the northerly winds the coldest 

 in the winter, goes far to show that the 82°"* parallel of latitude is hardly 

 influenced by the Siberian "cold pole". 



The slight variation in the temperature of the different winds in summer 

 seems to indicate only a slight thermic gradient polewards during that season. 



A comparison of the mean temperature during calms with the mean 

 lowest temperature, the mean temperature of the coldest wind, and the mean 

 temperature of the month, gives the following results. 



