Temperature, degrees F.: 
Mean annual      80 degrees
Warmest month    82 degrees
Coolest month    79 degrees
Highest          100 degrees
Lowest           60 degrees

Humidity: 
Relative per cent                78
Absolute grains per cubic foot    8.75

Wind movements in miles: 
Daily mean                       134
Greatest daily                   204
Least daily                       95

Prevailing wind direction—­N.E., November to April; SW., May to
October.

Cloudiness, annual per cent       53
Days with rain                   135

Rainfall in inches: 
Mean annual                   75.43
Greatest monthly             120.98
Least monthly                 55.65

The following is the mean temperature for the three seasons, at points specified: 

Cold.          Hot.           Wet. 
Manila   72 degrees    87 degrees    84 degrees
Cebu     75 degrees    86 degrees    75 degrees
Davao    86 degrees    88 degrees    87 degrees
Sulu     81 degrees    82 degrees    83 degrees

Seasons vary with the prevailing winds (monsoons or trade winds) and are classed as “wet” and “dry.”  There is no abrupt change from one to the other, and between periods there are intervals of variable weather.

The Spanish description of seasons is as follows: 

        Seis meses de lodo—­six months of mud. 
        Seis meses de polvo—­six months of dust. 
        Seis meses de todo—­six months of everything.

The northern islands lie in the track of the typhoons which, developing in the Pacific, sweep over the China Sea from NE. to SW. during the southwest monsoon.  They may be looked for at any time between May and November, but it is during the months of July, August, and September that they are most frequent.  Early in the season the northern region feels the greatest force, but as the season advances the typhoon gradually works southward and the dangerous time at Manila is about the end of October and the beginning of November.  Typhoons rarely, if ever, pass south of 9 degrees N. latitude.  Sometimes the typhoon is of large diameter and travels slowly, so far as progressive movement is concerned; at others it is of smaller dimensions, and both the circular and progressive motions are more rapid.  However they are always storms of terrific energy and frequently cause terrible destruction of crops and property on shore and of shipping at sea.  Thunderstorms, often of great violence, are frequent in May and June, before the commencement of the rainy season.  During July, August, September, and October the rains are very heavy.  The rivers and lakes are swollen and frequently overflow, flooding large tracts of low country.

At Manila the average rainfall is stated to be from 75 to 120 inches per annum, and there the difference between the longest and shortest day is only 1 hour 47 minutes and 12 seconds.  This rainfall, immense though it be, is small as compared with that of other parts of the archipelago; e.g., in Liano, NE. of Mindanao, the average yearly downpour is 142 inches.