138 Transactions of the Royal Society of South Africa, 
Table I, — Monthly Means of Sunshine and Cloudiness at Kimherley. 
Sunshine + Cloud = Total 
(%)• (%). (%)• 
January .... 75-3 . 41-1 . 116-4 
February .... 722 . 45-8 . 118-0 
March 737 . 418 . 115-5 
April 79-2 . 32-5 . 111-7 
May 81-7 . 26-7 . 108-4 
June 81-8 . 23-7 . 105-5 
July 82-7 . 20-3 . 103*0 
August .... 83-8 . 20-5 . 104*3 
September .... 79*4 . 32-8 . 112-2 
October .... 77-4 . 38*0 . 115-4 
November . . . 78-0 . 37 2 . 115-2 
December .... 76-7 . 38-8 . 115-5 
Year 78-5 . 33-3 . 111-8 
Hong-Kong (year) . . 43-8 . 66-6 . 110-4 
C6rdoba „ . . . 63-0 . 48-0 . 111-0 
Mauritius „ . . . 64-5 . 57 0 . 121-5 
The October numbers in the Kimberley table are curious — a drop in the 
sunshine and a rise in the cloudiness as compared with September and 
November. This effect seems to be common to the central Tableland of 
South Africa. Leaving out of account the October irregularity there is a 
maximum of sunshine early in August and a minimum late in February, a 
maximum of cloudiness towards the middle of February and a minimum 
about the end of July, sunshine and cloudiness together being greatest about 
the first week in February, and least about the last week of July. Evidently 
the cloudiness decreases faster from its maximum than the sunshine increases 
from its minimum. 
The table indicates roughly that the lower the percentage of sunshine 
and the higher the percentage of cloud, the higher the percentage of the sum 
of the two. This effect is analysed at greater length in Tables II and III at 
the end. Table II shows, for each grade of cloudiness from less than 15 
per cent, to more than 51 per cent., the variations month by month in the 
percentages of sunshine plus cloud. In each month there is a strong trend 
to greater numbers as the cloudiness increases, while the annual means are in 
substantial agreement with the monthly means of Table I. Thus a cloudiness 
of 45-8 per cent, in February goes with 118 per cent, of sunshine plus cloud, 
as a cloudiness of 45 to 46 per cent, in Table II goes with 117 per cent, of 
sunshine plus cloud. Other corresponding numbers above : 
Table I . . . 23-7% and 105-5%. 
Table II . . . 23 to 24% and 105-1%. 
Table I . . . 37-2% and 115-2%. 
Table II . . . 37 to 38% and 115-9%. 
