Transactions of the Boyal Society of South Africa. 
1. Cloud. Like Sign. Unlike Sign. 
Dec, Jan., Feb 12 times 28 times 
Mar., April, May 27 14 
June, July, Aug 21 20 
Sept., Oct., Nov 28 12 
2. Thunderstorms. 
Dec, Jan., Feb 15 times 26 times 
Mar., April, May 19 24 
June, July, Aug 22 18 
Sept., Oct., Nov.. 26 13 
3. Lightning. 
Dec, Jan., Feb 14 times 29 times 
Mar., April, May 25 18 
June, July, Aug 22 17 
Sept., Oct., Nov 21 18 
In summer the maximum temperature in the shade rises or falls 
according as the deviation of the resultant wind direction is positive or 
negative, whereas in the spring the case is the other way about. Thus 
in both seasons a deviation to the west in the vane means an increase of 
temperature. The minimum temperatures, both in the shade and over 
the grass, on the other hand, are higher when the vane tends easterly. 
Lastly, in the summer the temperature of the dew-point rises as the 
vane tends easterly ; whereas for the rest of the year the rise corresponds 
with a positive deviation in the resultant direction of the wind. 
