INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEMPERATURE. 



APRIL 



NORMAL PRESSURE. 



MEAN PRESSURE, NOON, G.M.T. 1903. 



1*0' ISO' 160* 170' ISO' 170* 160* ISO 140* 



00 



40' 3O' 20" 10* O' 10" 2O' 30' 40' 



1*0* ISO' ISO' 170' , 180' 170' 160 ISO 140' 



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



NORMAL AIR TEMPERATURE. 



APRIL 



MEAN AIR TEMPERATURE,NOON. G.M.T. 1903. 



I4O- 170- 170 160 ISO 140 



ISO' 170 180' 170 160 ISO 140' 



3O 20 10 O 10 20 30 



20 10 10 20 30- 



For explanation see Key map 



