F 6
negative waves of atmospheric pressure. The mean wind velocity for the year was 12.4 m.p.h., as against 10.9 m.p.h. in 1930 and 12.4 m.p.h. for the past 48 years. The maximum velocity for one hour, as recorded by the Beckley anemograph was 94 m.p.h. at noon on August 1, as against 66 miles in 1930 and 108 miles for the past 48 years. The maximum gust velocity, as recorded by the Dines-Baxendell anemograph, was at the rate of 136 m.p.h. from E.N.E. at 11h. 47m. a.m. on August 1, (the greatest on record) as against 83 m.p.h. in 1930 and 130 m.p.h. for the period 1910-30.
16. The relative humidity was considerably above normal in February and moderately above in May, September and December. It was moderately below normal in March, July and November and considerably below normal in October. The mean for the year was 79%, as against 78% in 1930 and 79% for the past 48 years. It frequently exceeded 95% in spring and summer. The lowest for the year was 29% at 0h. 45m. p.m. on March 13, as against 26% in 1929 and 12% for the past 48 years.
17. Rainfall at five Stations.-In the following table the monthly rainfall for the year 1931 at the Observatory is compared with the fall at the Police Station (Tai Po), the Botanical Gardens (Hong Kong), The Matilda Hospital (Mount Kellet), and Fanling.
Month Observatory Police Station (Tai Po) Botanical Gardens (Hong Kong) Matilda Hospital (Mount Kellet) Fanling January 0.325 inches 0.08 inches 0.33 inches 0.30 inches 0.20 inches February 0.550 inches 1.02 inches 0.74 inches 0.55 inches 0.87 inches March 3.175 inches 3.35 inches 4.06 inches 3.78 inches 2.62 inches April 8.930 inches 18.43 inches 8.90 inches 9.30 inches 16.12 inches May 12.000 inches 8.46 inches 14.32 inches 10.22 inches 9.40 inches June 11.600 inches 23.91 inches 12.14 inches 6.98 inches 15.26 inches July 9.860 inches 11.15 inches 11.94 inches 10.95 inches 10.28 inches August 14.270 inches 11.88 inches 13.64 inches 13.54 inches 12.84 inches September 13.430 inches 12.53 inches 14.82 inches 13.15 inches 13.31 inches October 0.730 inches 2.87 inches 0.66 inches 0.47 inches 0.52 inches November 0.965 inches 2.15 inches 0.78 inches 1.08 inches 1.70 inches December 4.555 inches 5.55 inches 4.83 inches 4.71 inches 4.19 inches Year 80.390 inches 101.38 inches 87.16 inches 75.03 inches 87.31 inches- F 6
negative waves of atmospheric pressure. The mean wind velocity for the year was 12.4 m.p.h., as against 10.9 m.p.h. in 1930 and 12.4 m.p.h. for the past 48 years. The maximum velocity for one hour, as recorded by the Beckley anemograph was 94 m.p.h. at noon on August 1, as against 66 miles in 1930 and 108 miles for the past 48 years. The maximum gust velocity, as recorded by the Dines-Baxendell anemograph, was at the rate of 136 m.p.h. from E.N.E. at 11h. 47m. a.m. on August 1, (the greatest on record) as against 83 m.p.h. in 1930 and 130 m.p.h. for the period 1910-30.
16. The relative humidity was considerably above normal in February and moderately above in May, September and Decem- ber. It was moderately below normal in March, July and November and considerably below normal in October. The mean for the year was 79%, as against 78% in 1930 and 79% for the past 48 years. It frequently exceeded 95% in spring and summer. The lowest for the year was 29% at Oh. 45m. p.m. on March 13, as against 26% in 1929 and 12% for the past 48 years.
17. Rainfall at five Stations.-In the following table the monthly rainfall for the year 1931 at the Observatory is com- pared with the fall at the Police Station (Tai Po), the Botanical Gardens (Hong Kong), The Matilda Hospital (Mount Kellet), and Fanling.
Matilda
Month.
Obser- Police Botanical Hospital vatory Station Gardens (Mount Fanling. (Kowloon). (Taipo).
(Hong
Kellet,
Kong).
Hong
Kong).
inches. inches.
inches.
inches.
inches.
January,
0.325
0'08
0'33
0:30
0'20
February,
0'550
1'C2
0'74
0'55
0.87
March,
37175
3'35
4:06
3778
2.62
April,
8.930
18.43
8.90
9:30
16.12
May,
I 2'000
8.46
14.32
10'22
9:40
June,
11.600
23191
12 14
6.98
15.26
July,
9.860
1115
II 94
10.95
10.28
August,
14'270
11.88
13.64
13-54
12.84
September,..
13°430
12753 1482
13715
13731
October,
0.730
2-87 0.66
047
0'52
November,
0.965
2-15 0.78
1'08
1.70
December,
4555
5:55 4.83
4771
4'19
Year
80°390
101.38 87.16
75°03
87.31
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