MEAN MONTHLY TEMPERATURE. 



The above is summarised in the following table : — 



Table 39. 

 Data used for Mean Monthly Temperature at Cape Adare. 



81 



Framheim. — Temperature observations were taken at Framheim at 8 a.m., 2 p.m. and 

 8 P.M. Professor Mohn has reduced the mean monthly temperatures for the period April, 1911, 

 to January, 1912, from the 8 a.m. and 8 p.m. observations. Values for the months February 

 and March have been obtained by completing the curve for yearly variation by freehand. 



Barrier. — The method of obtaining mean monthly temperatures on the Barrier have been 

 described above (page 32). The values used refer to the Barrier north of One Ton Camp 

 79° 30' S., and south of Ross Island. 



Mean AlontMi/ Temperatures in McMurdo Sound. — Table 40 contains the mean temperature 

 observed each month during five years in McMurdo Sound. 



Table 40. 

 Mean Monthly Temperature. {°F.) 



In the previous section we have shown that daily non-periodic temperature changes are 

 greater in the winter than in the summer, and it is easy to see from the above table that 

 the monthly temperatures are moie irregular in the wiiater than in the summer. Thus the 

 difference between the warmest and coldest July is 15-5°F., while the corresponding difference 

 for January is only 4-8°F. This is still more clearly seen from the following table in which 

 the departures of each month from the mean temperature of the month ba.sed on the five 

 years are given. 



1904. 



11 



