The Climate of East London, Cape Colony. 



223 



of the Cape Meteorological Commission, they are more frequent in 

 the winter on the west coast than they are (during the same season) 

 on the south. Stewart gives the following monthly distribution of a 

 total of 41 days upon which hot winds blew at Port Nolloth during 

 1900 * :— 



April 

 May 

 June 



1 



July 



6 



Aug. 



1 



Sept 



12 

 8 

 3 



Their periodicities, therefore, probably depend mainly upon the 

 annual movements of the permanent anticyclones of the southern 

 hemisphere. 



There seems to be no doubt that these hot winds originate on the 

 table-Land, albeit every northerly wind, even with a low barometer, 

 is not necessarily a hot wind.f The following Table gives the 



Synoptic Elements dubing a Hot Wind at East London. 





Pressure. 



Tefrnperature. 





East 

 London. 



Durban. 



Kimberley. 



East 

 London. 



Durban. 



Kim- 

 berley. 



Third day before 

 Second day before 

 First day before 



Day 



First day after ... 

 Second day after 

 Third day after... 



inches. 

 30-149 

 30-171 

 30-111 

 29-902 

 29-988 

 30-095 

 30-125 



inches. 

 30-248 

 30-309 

 30-288 

 30-144 

 30-086 

 30-219 

 30-296 



inches. 

 26-264 

 26-290 

 26-276 

 26-233 

 26-201 

 26-219 

 26-231 



o 

 68 

 69 

 75 

 92 

 70 

 70 

 69 



o 



78 

 77 

 79 

 82 

 82 

 78 

 79 



o 



75 

 77 

 79 

 79 

 76 

 76 

 78 



average pressure and average maximum temperature conditions for 

 the fifteen most strongly marked hot winds blowing at East London 

 in the four years 1897-1900, for the seven days of which the middle 

 day is the day of the hot wind, together with the corresponding 

 synoptic elements for Kimberley and Durban. At East London 

 itself the day of a hot wind generally opens with the wind some- 

 where about north-west, and not very much cloud ; at the same 

 time at Kimberley the wind is fairly strong between north and 

 north-east and the sky clear ; at Durban calms or north-east winds 

 are the rule, and clear skies. 



* C. Stewart, Science in South Africa, Art. " Meteorology," p. 40, 1905. The 

 temperatures are not given. 



f Sparrman was informed that on the Krombeek River, some distance east of 

 Swellendam, " the west wind was the warmest ; but what was very extraordinary 

 was that the north wind was the coldest " {Voyage, vol. ii., p. 329). 



