183 
rain falls have the fewest wet days. Beginning with the 
month in which rain falls upon the fewest days, we have 
the following order : May, July, March, April, June, Novem- 
ber, August, February, January, September, December, 
October. April, in which the least rain falls, comes fourth 
instead of first; November, the wettest month except Octo- 
ber, comes sixth, evidently showing very heavy falls on 
fewer days; August and February come next one another, 
although the former month has about half as much rain 
again ; December and October are nearly equal, the latter — 
the wet month of the year — carrying off the palm as regards 
the number of days on which rain falls. The number of 
days on which rain falls is a veiy important one, as floods 
are often caused by heavy rainfall falling continuously over 
a few days during a comparatively dry month. August 
and November would be evidently months in which to look 
for floods, from the fact that with a rainfall not far below 
that of October, rain falls on much fewer days ; this remark 
refers especially to November. 
Looking at the annual number of days on which rain 
falls here, viz. a ten years’ average of 188 days out of the 
365, it appears that we have rain on rather more than half 
the days of the year. 
OLD TRAFFORD, MANCHESTER. 
Rain Gauge 3 feet above the ground, and 106 feet above sea level. 
Quarterly 
Periods. 
1871. 
Fall 
in 
Inches. 
Average 
of 
78 
Years. 
Differ- 
ence. 
No. of 
Days 
Rain- 
fall in 
1871. 
Quarterly 
Periods. 
Differ- 
ence. 
1870. 
1871. 
78 Years. 
1871. 
r 
Jan. . . 
3'300 
2'515 
+0-785 
13 
) 
41 
3S 
Feb. . . 
2-732 
2-401 
+0-331 
17 
1 7-204 
7-588 
+0-384 
. 
March. 
1-550 
2-28S 
—0-732 
S 
i 
r 
April. . 
3-517 
2-050 
+1+07 
21 
) 
35 
44 -j 
May . 
2-075 
2-303 
—0-228 
8 
V 7-164 
S-255 
+1-091 
June. . 
2 -663 
•2-S11 
—0-148 
15 
) 
July . . 
3540 
3-505 
+0-041 
25 
) 
32 
52- 
August 
1-600 
3-510 
—1-910 
11 
V 10-285 
8-967 
— 1-318 
Sept. . . 
3-821 
3-270 
+0-551 
16 
i 
Oct. .. 
4-514 
3-8S5 
+0-629 
IS 
) 
47 
48 
Nov. . . 
1-407 
3-784 
-2-377 
10 
1 10-965 
8-418 
—2-547 
1 
Dee. . . 
2-497 
3-290 
—0-799 
20 
j 
155 
182 
33-223 
35-618 
—2-390 
182 
35-618 
33-223 
| 2-390 
