432 CHAMBERLAIN. 



Table I. — Annual thermic oscillation in the Philippine Archipelago.' 



Annual 

 oscillation. 



I^lace. 



Aparri.. 

 Tarlac. 

 Arayat . 

 Manila. 



°C. 



ojr 



6. .5 : 11.7 



5.2 I 9.1 



4.6 j 8.3 



3.5 I 6.3 



Latitude 



(north). 



De- 



Min- 



grees. 



I • 



utes. 



18 



22 



1.^ 



31 



15 



8 



14 



36 



Annual 

 oscillation. 



Place. 



Iloilo .. 

 Ormoc- 



Cebu 



Davao . 



3.8 ' 6.8 



2.8 1 5.0 



2.7 I 4.9 



2.2 , 4.0 



Latitude 

 (north). 



De- 

 grees. 



Min- 

 utes. 



10 



42 



11 



00 



10 



18 



7 



1 



" This indicates the variation of the mean monthly temperature and not the extreme. 



For Manila, which is representative of most of the region under considera- 

 tion in this report, the normal monthly means of temperature for the period 

 1883-1902 are shown in Table II. The maximum recorded temperature in Ma- 

 nila (May, 1889) was 37°.8 C. (100° F.), and the minimum (Jan. 1907) was 

 15° C. (59° P.). 



Table II. — Normal monthly means, Manila. 



Month. 



January 25. 



February 



March . 



April 



May 



June 



1 °c.' 



1 



II 

 OF. 1 



25.0 



77.0 



2,5.4 



77.7 



, 26.8 



80.2 



1 28.3 



82.9 



28.6 



83.4 



27.9 



82. 2 



Month. 



°C. 



July 



August 



September. 



October 



November. 

 December . 



27.1 

 27.1 

 27.0 

 26.9 

 26.1 

 25.2 



°F. 



80.7 

 80.7 

 80.6 

 80.4 

 79.0 

 77.3 



The rainfall for the sections where the blond-brunette observations were being 

 carried out ranges from 205 to 256 centimeters per year." The degree of cloudi- 

 ness is of much importance in an observation having to do with the possible 

 infiuenee of tropical light. The average cloudiness for Manila is given below, 

 the scale being from for a clear sky to 10 with the sky entirely covered. The 

 table also shows the average of clear and variable days and the average hours 

 of sunshine. 



Table III. — Average cloudiness, average clear and variable days, and average 

 hours of sunshine monthly in Manila. 



Month. 



1 

 AvPTflffP Average 

 nZ,,/ clear and 

 fness" ^^"^''le 



Average 

 hours of 

 sunshine. 



193 

 220 

 247 

 264 

 220 



Month. 



Average 

 cloud- 

 iness. 



Average 



clear and 



variable 



days. 



Average 

 hours of 

 sunshine. 



1 



January 



February ... 



March 



April 



May 



June.. 



I July... . 



4. 6 23. 9 

 3. 8 23. 8 

 3. 8 23. 9 

 3. 5 25. 1 

 5. 1 19. 9 



August 



September 



October 



November 



December 



Mean . 



7.5 

 7.4 

 6.1 

 5.8 

 .5.6 



14.0 

 13.1 

 17.1 

 18.6 

 22.6 



143 

 135 

 172 

 160 



157 



B. 8 17. 3 

 7.5 14.9 



1 



160 

 . 147 



5.6 ! 19.5 



1 ' 



184.8 



' This does not include Camp John Hay and Camp Keithley where the rainfall 

 is much higher. 



