INTERNATIONAL ANTARCTIC CO-OPERATION. 



CHARTS OF MEAN SEA LEVEL PRESSURE AND AIR TEMPERATURE. 



DECEMBER 

 NORMAL PRESSURE. M EAN PRESSURE, N DON, G.M.T. I 9 3 



30" 20' 10 0" ID" 20* 30 



NORMAL AIR TEMPERATURE. 



DECEMBER 



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



I4O* ISO" 160* 170* 180 170' 160 ISO I4O* 



I4O* ISO' ISO' 170' 180 170 160 ISO 



For expla.na.tion see Key map 



