INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEMPERATURE. 



APRIL 



NORMAL PRESSURE. 



MEAN PRESSURE.NOON, G M.T. I9O3. 



50* 160' 170 180' 170' 160" ISO 



40' 30' 20" ',0 O" 10' 20* 30' 40" 



I4O ISO 160 170 ^> 180 170 160 



KXJ 



NORMAL AIR TEMPERATURE. 



APRIL 



MEAN AIR TEMPERATURE, N DON, G.M.T. 1903. 



1*0' ISO' 160' 170 180 170' 160 ISO l" 



20' 10' 0* 10" SO' 30' 40" 



140* ISO* ISO* 170' 180* 170' ISO* ISO* 140' 



3O" 20" 10" O* 10" 20 30" 



For explanation see Key map 



