F 1
The wind velocity was considerably below normal in January and October and moderately below in February, June and September. It was moderately above normal in May and July. The mean velocity for the year was 12.0 m.p.h. as against 11.4 m.p.h. in 1919 and 12.7 m.p.h. for the past 37 years. The maximum velocity for one hour, as recorded by the Beckley Anemograph, was 51 miles at 2 a.m. on July 31st as against 60 miles in 1919 and 108 for the past 37 years. The maximum squall velocity, as recorded by the Dines-Baxendell Anemograph, was at the rate of 61 m.p.h. at 10h. 58m. p.m. on July 30th as against 84 m.p.h. in 1919 and 105 m.p.h. for the past 11 years.
Rainfall at Four Stations. In the following table the monthly rainfall for the year 1920 at the Observatory is compared with the fall at the Police Station, Taipo, the Botanical Gardens, and the Matilda Hospital, Mount Kellet :-
Months. Observatory Police Station (Kowloon). (Taipo). Botanical Gardens (Hongkong). Matilda Hospital (Hongkong). inches. inches. inches. inches. inches. January, 0.065 0.11 February, 2.640 5.44 3.10 0.04 2.66 March, 1.390 2.15 1.50 1.20 April, 8.265 7.03 7.88 7.43 May, 18.155 13.44 17.68 14.44 June, 15.555 18.82 17.90 13.78 July, 24.040 24.55 27.28 20.65 August, 10.975 28.35 14.74 8.93 September, 11.750 7.90 17.22 12.40 October, 6.190 4.68 8.66 8.11 November, 7.045 7.50 7.16 7.78 December, 1.810 0.59 0.92 0.55 Year, 107.880 120.56 124.04 97.97Floods. The heaviest rainfall occurred at the Observatory as follows:-
Period. Amount. Duration. Greatest fall in 1 hour. Time. inches. hours. inches. 4 d. h. May...... 28 4 to June 1.20 May......28 13 9 to July...... 18 7 to July..... 2.695 June ...12 18 30 16 to Sept...... 10 1.12 July......19 10 22 to Nov....... 17 8 to ... Aug.... 4 8.275 July......31 16 3.1 Sept... 13 14 8.420 Sept......12 21 Nov.... 18 9 4.860 Nov.......17 17 0.64