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15
No. 87,
HONGKONG.
REPORT OF THE DIRECTOR OF THE OBSERVATORY ON FIVE-DAY MEANS OF THE PRINCIPAL
METEOROLOGICAL ELEMENTS FOR 1886.
Presented to the Legislative Council, by Command of His Excellency
the Officer Administering the Government,
on the 4th March, 1887.
FIVE-DAY MEANS OF THE PRINCIPAL METEOROLOGICAL
ELEMENTS FOR 1886.
The following five-day means have been constructed according to the recommendations of the International Meteorological Congress.
Hongkong Observatory: The first column exhibits the height of the barometer in inches reduced to 32° Fahrenheit but not to sea level. The cistern is 110 feet above mean sea level. The means have been derived from the hourly readings.
The second column exhibits the temperature in degrees Fahrenheit as derived from the hourly readings.
The third and fourth columns exhibit the relative humidity in percentage of saturation and the vapour tension in inches of mercury as derived from the means of the hourly readings of the dry and damp bulb thermometers.
The fifth column exhibits the velocity of the wind in miles per hour derived from the hourly readings.
The sixth column exhibits the percentage of the whole sky, that was covered by clouds, from observations made every three hours.
The seventh column exhibits the average daily number of hours during which the sun shone brightly enough to mark the cards.
The eighth column exhibits the average amount of rain in inches that fell in one day, from mid- night to mid-night as derived from the hourly readings.
Victoria Peak: The first column exhibits the height of the barometer in inches reduced to 32° Fahrenheit but not to sea level as derived from tri-diurnal observations. The cistern is 1816 feet above mean sea level.
The second column exhibits the temperature as derived from observations made at 10 a. and 10 p. The third and fourth columns exhibit the relative humidity and tension of vapour as derived from tri-diurnal observations.
The fifth column exhibits the force of the wind (0-12) as derived from tri-diurnal observations. The sixth column exhibits the average amount of rain in inches, that fell in one day as measured at 10 a. and entered to preceding day.
The five-day means of temperature in 1884, derived from observations made in STEVENSON'S screen at 10 a. and 10 p. and reduced to true air temperature and mean of 24 hours are as follows:— 62.1, 57.2, 62.5, 60.2, 62.7, 64.2, 57.0, 51.0, 55.6, 58.9, 58.2, 60.2, 60.4, 60.0, 61.3, 61.1, 63.9, 63.7, 60.1, 64.0, 65.8, 66.9, 72.0, 69.3, 72.3, 73.9, 69.3, 73.6, 75.4, 75.0, 76.5, 76.0, 78.6, 80.7, 79.3, 81.3, я0.3, 80.9, 82.5, 83.3, 82.2, 80.3, 80.5, 82.1, 82.1, 78.3, 83.1, 81.0, 81.0, 81.8, 79.8, 80.8, 80.9, 78.5, 78.6, 80.0, 80.1, 75.2, 74.7, 73.0, 76.5, 74.6, 70.3, 70.7, 64.8, 58.4, 61.4, 62.4, 59.7, 60.2, 59.5, 59.8, 57.7.
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