F 4
Principal features of the Weather in 1930:-The principal features of the weather in 1930 were:
(a) A typhoon which passed about 50 miles to the S. W. of Hong Kong in the evening of July 24 on a N. N. W. track, producing a strong gale at Hong Kong.
(b) abnormally low barometer in July.
(c) abnormally low temperature in January.
(d) abnormally low humidity in March.
(e) abnormally high pressure, heavy rain, high wind velocity, with moderately low temperature, in September.
Barometric pressure was considerably above normal in June, September and November, and very considerably below normal in July. The mean pressure for the year at station level (109 feet above sea-level) was 29.850 ins., as against 29.845 ins. in 1929 and 29.842 ins. for the past 47 years. The highest pressure was 30.840 ins. at 9h.45m. a.m. on December 24, as against 30.282 ins. in 1929 and 30.509 ins. for the past 47 years. The lowest pressure was 29.175 ins. at 5.30 p.m. on July 24, as against 28.912 ins. in 1929 and 28.590 ins. for the past 47 years.
The temperature of the air was very considerably below normal (the lowest on record) in January, considerably above in April, moderately above in February, May, November and December, and moderately below in September. The mean temperature for the year was 72°.4, as against 72°.6 in 1929 and 71.9 for the past 47 years. The highest temperature was 92°.9 at 0h.40m p.m. on July 1, as against 92°.2 in 1929 and 97°.0 for the past 47 years. The lowest temperature was 41°.2 at 7.10 a.m. on January 8, as against 44°.4 in 1929 and 32°.0 for the past 47 years.
The total rainfall for the year was 96.08 inches, as against 69.82 inches in 1929 and 85.61 inches for the past 47 years. From October 1 to the end of the year only 1.33 inch of rain fell. Heavy rain in September, to the extent of 28.24 inches, probably saved the Colony from another water famine. There was a considerable shortage from April to June and in August. The greatest fall in one civil day was 7.96 inches on September 17, as against 7.15 inches in 1929 and 21.02 inches for the past 47 years. The greatest fall in one hour was 2.36 inches between 8th. and 9th. a.m. on August 9, as against 2.73 inch in 1929 and 3.96 inches for the past 47 years.
The wind velocity was considerably below normal from January to March and also in August and October.
It was moderately above in September. The mean velocity for the year was 10.9 m.p.h., as against 11.6 m.p.h. in 1929 and 12.4 m.p.h. for the past 47 years. The maximum velocity for one
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