INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEM PERATU RE. 



SEPTEMBER 



NORMAL PRESSURE 



MEAN PRESSURE, NOON, GM.T 1902. 



3O" 20 



1*0 ISO I6O 170 180 170 160 '-5Q 



SEPTEMBER 



NORMAL AIR TEMPERATURE 



M EAN AIR TEMPER ATU R E. N DON, G.M T. 1902 



I4O' ISO' 160* 170 ISO' 170 160 ISO' 





For explanation see Key maj> 



