Page:Palestine Exploration Fund - Quarterly Statement for 1894.djvu/67

Rh viz., 100°, took place on October 16th; on this day the maximum temperature at Jerusalem was 90°·5.

The lowest temperature of the air in each month is shown in column 6. The lowest in the year was 28°·5, on January 23rd; the temperature was below 40°, in January, on 22 nights; in February it was below 40° on 20 nights; and in March, on 8 nights. Therefore the temperature was below 40° on 50 nights in the year. The yearly range of temperature was 76°·5. At Sarona the temperature was below 40° on only 9 nights in the year; the lowest temperature in the year was 32°, on January 22nd and 24th. The yearly range at Sarona was 68°.

The range of temperature in each month is shown in column 7, and these numbers vary from 23°·5 in February, to 50° in both May and August. At Sarona the range of temperature in each month varied from 24° in February to 51° in March.

The mean of all the highest by day, of the lowest by night, and of the average daily ranges of temperature, are shown in columns 8, 9 and 10 respectively. Of the high day temperatures, the lowest, 49°·4, is in January, and the highest, 88°, in August. At Sarona, of the high day temperatures, the lowest, 60°·2, is in January, and the highest, 86°, in August.

Of the low night temperatures, the coldest, 38°·0, is in January, and the warmest, 63°·5, in August. At Sarona, of the low night temperatures, the coldest, 40°·9, is in January, and the warmest, 68°·9, in August.

The average daily range of temperature, as shown in column 10, the smallest, 11°, is in February, and the largest, 24°·5, is in August. At Sarona, the average daily range, the smallest, 14°·l, is in February, and the largest, 24°·4, in April.

In column 11, the mean temperature of each month, as found from observations of the maximum and minimum thermometers only, are shown; the month of the lowest temperature is January, 43°·7, and that of the highest, August, 75°·8. The mean for the year is 61°·6. At Sarona, the mean temperature of each month, the lowest is January, 50°·5, and that of the highest August, 77°·4. The mean for the year at Sarona is 65°·7.

The numbers in columns 12 and 13 are the monthly means of a dry and wet bulb-thermometer, taken daily at 9 a.m., and in column 14 the monthly temperature of the dew-point, or that of the temperature at which dew would have been deposited. The elastic force of vapour is shown in column 15, and in column 16 the water present in a cubic foot of air, in January and February, was as small as 2·8 grains, and as large as 5 grains in August. The numbers in column 18 show the degree of humidity, saturation being considered as 100; the smallest number in this column is in June, and the largest number is in January and February. The weight of a cubic foot of air under its pressure, temperature, and humidity, at 9 a.m., is shown in column 19.

The most prevalent wind in January was S.W., and the least