The Climate of East London, Gape Colony. 



219 



reduced to a temperature of 32° are given in the following Table, 

 together with the total range observed in 21 years : — 





Means. 



Maxima. 



Minima. 



Range. 



Jan 



inches. 



29-920 

 •940 

 •965 



30-019 

 •056 

 •127 

 •139 

 •102 

 •096 

 •031 



29-973 

 •940 



inches. 



30-320 

 •302 

 •390 

 •508 

 •596 

 •512 

 •648 

 •718 

 •616 

 •623 

 •450 

 •377 



inches. 



29-373 

 •550 

 •526 

 •630 

 •335 

 •664 

 •611 

 •551 

 •549 

 •462 

 •427 

 •497 



inch. 

 •947 



Feb 



•752 



Mar 



•864 



April 



May 



July 



Aug 



Sept 



Oct 



•878 

 1-261 



•848 

 1-037 

 1-167 

 1-067 

 1-161 



Nov 



1-023 



Dec 



•880 









30-026 



30-718 



29-335 



1-383 



The annual variation of pressure is of the same order as that 

 obtaining at Durban and Kimberley, namely, greatest in July and 

 least in January. It would appear, however, from the general run 

 of these monthly means that the turning-points of the smoothed 

 curve of pressure are a day or two later at East London than they 

 are at Durban, just as those of Durban are a day or two later than 

 they are at Kimberley. The range of monthly means from January 

 to July is "22 inch, or about *02 inch less than the ranges at Durban 

 and Kimberley, but practically the same as that of Philippolis and 

 Aliwal North. It is therefore typical of the pressures of the low 

 lands surrounding the South African table-land, and no doubt 

 depends in some way (as in the case of Durban) upon the variation 

 of maximum temperatures inland. The greatest pressure observed 

 during the period under review was 30*718 inches, the least 

 29'335 inches, giving a total range of 1*383 inch. This is rather 

 greater than the range found for Durban in the ten years 1888-97 

 {i.e., 30*801 - 29*507 = 1*294 inch). The Durban observations, how- 

 ever, are made twice a day, at 9 a.m. and 3 p.m., while the East 

 London observations are only made once, at 8 a.m. Were observa- 

 tions made at East London also at 3 p.m., we should expect still 

 lower minimum pressures, and therefore it seems to follow that the 

 total range at East London must be somewhat greater than that at 

 Durban, while the actual mean pressure at the former place would 

 be somewhere about a tenth of an inch the lesser. The greatest 

 ranges of pressure are found in May, and in July-November, being 



