61 
The sums of the falls of rain in five day-periods, therefore, exhibit 
very considerable differences in every month ; the smallest is in Decem¬ 
ber, viz., 2*26 in., and the largest is in October, 9’24 in.; they are also 
large in January, July, and August. 
The mean difference of the four months January, July, August, and 
October is 7"63 in., and of the remaining eight months is 4-35 in. 
The five-day period distinguished by the least rain in the year is from 
March 22 to 26; and that by the greatest is October 23 to 27; the 
difference between the two amounts is 15’45 in 44 years. 
By taking the numbers in Table XIV. in successive ten-day groups 
the next Table was formed. 
TABLE XVI. 
* Showing the Sum of Rainfall in Ten-day Periods. 
January 1-10 . 
1972 
June 30 to July 9 . 
26-70 
„ 11-20 . 
29-67 
July 10-19 
34-19 
„ 21-30 . 
23-58 
„ 20-29 
36-98 
January 31 to February 9 
24-27 
July 30 to August 8 
36-94 
February 10-19 
18-71 
August 9 to 18 
38-57 
February 20 to March 1 . 
24-98 
„ 19-28 . 
38-15 
March 2-11 
18-50 
August 29 to September 7 
32-13 
„ 12-21 . 
21-58 
September 8-17 
36-47 
„ 22-31 . 
17-84 
18-27 
37-88 
April 1-10 
22-87 
September 28 to October 7 
37-32 
„ 11-20 
19-85 
October 8-17 . 
32-75 
„ 21-30 
23-89 
„ 18-27 . 
43-45 
May 1-10 
29-83 
October 28 to November 6 
32-55 
„ 11-20 
25-39 
November 7-16 
28-85 
„ 21-30 
27-98 
„ 17-26 
29-91 
May 31 to June 9 
28-63 
November 27 to December 6 
30-16 
June 10-19 
30-47 
December 7 -16 
22-45 
„ 20-29 . 
28-15 
„ 17-26 
21-88 
The differences between these numbers are at times great; in January 
the sum, in the first ten days is less than in the second by 10*0 in. 
From this time the differences are generally small, with the exception 
of that between the period ending July 9 and that ending July 19, 
which is 7'5 in., till between the ten-day period ending October 17 and 
that ending October 27, the difference being 10‘7 in., and also between. 
