AnnualReport-1917 — Page 151

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F 3

Eye observations of barometric pressure, temperature of the air and of evaporation, and the amount of cloud were made at each hour of Hongkong Standard time. The character and direction of motion of the clouds were observed every three hours. Daily readings were taken of self-registering maximum and minimum thermometers.

Principal Features of the Weather in 1917.-The principal features of the weather in 1917 were the heavy rains from July 10 to 29, when 30.06 inches fell, a general defect of wind velocity, and a typhoon which passed a few miles to the north of the Observatory on August 13.

Barometric pressure was considerably below normal in April and considerably above normal in January. The mean pressure for the year was 29.845, as against 29.832 in 1916 and 29.841 for the past 34 years. The highest pressure was 30in.494 on January 10, as against 30in.332 in 1916 and 30.509 for the past 34 years. The lowest pressure was 29in.078 on August 13, as against 29.304 in 1916 and 28.735 for the past 34 years.

The temperature of the air was considerably below normal in January and December, and moderately above normal in September. The mean temperature for the year was 71.0, as against 71.8 in 1916 and 71.8 for the past 34 years. The highest temperature was 90.8, on July 13, as against 92.4 in 1916 and 97.0 for the past 34 years. The lowest temperature was 38.8, on January 9, as against 39.3 in 1916 and 32.0 for the past 34 years.

The wind velocity was below normal in each month of the year. It has been below normal every month since August 1911, except in July 1914 and February 1916. There has been a gradual increase however, relatively to the normal, since June. This may possibly indicate the end of the long negative wave. There is still considerable uncertainty as to whether this wave is a meteorological phenomenon or is due to a change in the anemograph factor. The mean velocity for the year was 11.2 m.p.h., as against 12.2 m.p.h. in 1916 and 12.8 for the past 34 years. The maximum velocity for one hour, as recorded by the Beckley Anemograph, was 63 miles, at 15h on August 13, as against 55 miles in 1916 and 108 miles for the past 34 years. The maximum squall velocity, as recorded by the Dines-Baxendell Anemograph, was at the rate of 93 m.p.h., at 14h 20m on August 13, as against 65 m.p.h. in 1916 and 105 m.p.h. for the past 7 years.

Rainfall at Four Stations.-In the following table the monthly rainfall at the Observatory is compared with the fall at the Police Station, Taipo; the Botanical Gardens; and the Matilda Hospital, Mount Kellet:

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F 3 Eye observations of barometric pressure, temperature of the air and of evaporation, and the amount of cloud were made at each hour of Hongkong Standard time. The character and direction of motion of the clouds were observed every three hours. Daily readings were taken of self-registering maximum and minimum thermometers. Principal Features of the Weather in 1917.-The principal features of the weather in 1917 were the heavy rains from July 10 to 29, when 30.06 inches fell, a general defect of wind velocity, and a typhoon which passed a few miles to the north of the Observatory on August 13. Barometric pressure was considerably below normal in April and considerably above normal in January. The mean pressure for the year was 29.845, as against 29.832 in 1916 and 29.841 for the past 34 years. The highest pressure was 30in.494 on January 10, as against 30in.332 in 1916 and 30.509 for the past 34 years. The lowest pressure was 29in.078 on August 13, as against 29.304 in 1916 and 28.735 for the past 34 years. The temperature of the air was considerably below normal in January and December, and moderately above normal in September. The mean temperature for the year was 71.0, as against 71.8 in 1916 and 71.8 for the past 34 years. The highest temperature was 90.8, on July 13, as against 92.4 in 1916 and 97.0 for the past 34 years. The lowest temperature was 38.8, on January 9, as against 39.3 in 1916 and 32.0 for the past 34 years. The wind velocity was below normal in each month of the year. It has been below normal every month since August 1911, except in July 1914 and February 1916. There has been a gradual increase however, relatively to the normal, since June. This may possibly indicate the end of the long negative wave. There is still considerable uncertainty as to whether this wave is a meteorological phenomenon or is due to a change in the anemograph factor. The mean velocity for the year was 11.2 m.p.h., as against 12.2 m.p.h. in 1916 and 12.8 for the past 34 years. The maximum velocity for one hour, as recorded by the Beckley Anemograph, was 63 miles, at 15h on August 13, as against 55 miles in 1916 and 108 miles for the past 34 years. The maximum squall velocity, as recorded by the Dines-Baxendell Anemograph, was at the rate of 93 m.p.h., at 14h 20m on August 13, as against 65 m.p.h. in 1916 and 105 m.p.h. for the past 7 years. Rainfall at Four Stations.-In the following table the monthly rainfall at the Observatory is compared with the fall at the Police Station, Taipo; the Botanical Gardens; and the Matilda Hospital, Mount Kellet:

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F 3 Eye observations of barometric pressure, temperature of the air and of evaporation, and the amount of cloud were made at each hour of Hongkong Standard time. The character and direction of motion of the clouds were observed every three hours. Daily readings were taken of self-registering maximum and minimum thermometers. Principal Features of the Weather in 1917.-The principal features of the weather in 1917 were the beavy rains from Jaly 10 to 29, when 30-06 inches fell, a general defect of wind velocity, and a typhoon which passed a few miles to the north of the Observatory on August 13. Barometric pressure was considerably below normal in April and considerably above normal in January. The mean pressure for the year was 29845, as against 29832 in 1916 and 29841 for the past 34 years. The highest pressure was 30ins •494 on sanuary 10, as against 30in 332 in 1916 and 30509 for the past 34 years. The lowest pressure was 29ins 078 on August 13, as against 29304 in 1916 and 28735 for the past 34 years. The temperature of the air was considerably below normal in January and December, and moderately above normal in Septem- ber. The mean temperature for the year was 71-0, as against 71-8 in 1916 and 71°8 for the past 34 years. The highest tem- perature was 90°8, on July 13, as against 92°4 in 1916 and 970 for the past 34 years. The lowest temperature was 388, on January 9, as against 39-3 in 1916 and 3200 for the past 34 years. The wind velocity was below normal in each month of the year. It has been below normal every month since August 1911, except in July 1914 and February 1916. There has been a gradual increase however, relatively to the normal, since June. This may possibly indicate the end of the long negative wave. There is still considerable uncertainty as to whether this wave is a meteorological phenomenon or is due to a change in the anemo- graph factor. The mean velocity for the year was 11-2 m.p.h., as against 12.2 m.p.h. in 1916 and 128 for the past 34 years. The maximum velocity for one hour, as recorded by the Beckley Anemograph, was 63 miles, at 15 on August 13, as against 55 miles in 1916 and 108 miles for the past 34 years. The maximum squall velocity, as recorded by the Dines-Baxendell Anemograph, was at the rate of 93 m.p.h., at 14h 20m on August 13, as against 65 m.p.h. in 1916 and 105 m.p.h. for the past 7 years. h Rainfall at Four Stations.-In the following table the monthly rainfall at the Observatory is compared with the fall at the Police Station, Taipo; the Botanical Gardens; and the Matilda Hospital, Mount Kellet :----

2026-05-06 15:42:25 · Baseline

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F 3

Principal Features of the Weather in 1917.-The principal features of the weather in 1917 were the beavy rains from Jaly 10 to 29, when 30-06 inches fell, a general defect of wind velocity, and a typhoon which passed a few miles to the north of the Observatory on August 13.

Barometric pressure was considerably below normal in April and considerably above normal in January. The mean pressure for the year was 29845, as against 29832 in 1916 and 29841 for the past 34 years. The highest pressure was 30ins •494 on sanuary 10, as against 30in 332 in 1916 and 30509 for the past 34 years. The lowest pressure was 29ins 078 on August 13, as against 29304 in 1916 and 28735 for the past 34 years.

The temperature of the air was considerably below normal in January and December, and moderately above normal in Septem- ber. The mean temperature for the year was 71-0, as against 71-8 in 1916 and 71°8 for the past 34 years. The highest tem- perature was 90°8, on July 13, as against 92°4 in 1916 and 970 for the past 34 years. The lowest temperature was 388, on January 9, as against 39-3 in 1916 and 3200 for the past 34 years.

The wind velocity was below normal in each month of the year. It has been below normal every month since August 1911, except in July 1914 and February 1916. There has been a gradual increase however, relatively to the normal, since June. This may possibly indicate the end of the long negative wave. There is still considerable uncertainty as to whether this wave is a meteorological phenomenon or is due to a change in the anemo- graph factor. The mean velocity for the year was 11-2 m.p.h., as against 12.2 m.p.h. in 1916 and 128 for the past 34 years. The maximum velocity for one hour, as recorded by the Beckley Anemograph, was 63 miles, at 15 on August 13, as against 55 miles in 1916 and 108 miles for the past 34 years. The maximum squall velocity, as recorded by the Dines-Baxendell Anemograph, was at the rate of 93 m.p.h., at 14h 20m on August 13, as against 65 m.p.h. in 1916 and 105 m.p.h. for the past 7 years.

AnnualReport-1917 — Page 151

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