1921 
396 The Philippine Journal of Science 
Table 1. — Mean temperature for ten 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
Mean for ten years 
years, 1909-1918, at Bangkok, Siam. 
°C. 
25.2 
27.4 
29.1 
30.7 
29.8 
29.1 
28.8 
28.5 
28.1 
27.7 
26.6 
25.1 
28.0 
TABLE 2. — Mean daily range of temperature for ten years, 1909-191)8, at 
Bangkok, Siam. 
°C. 
January 
12.2 
February * 
11.2 
March 
10.3 
April 
10.3 
May 
9.7 
June 
8.6 
July 
8.2 
August 
8.1 
September 
7.7 
October 
7.4 
November 
7.9 
December 
9.9 
Mean for ten years 
9.3 
Table 3. — Mean solar radiation for ten years, 1909-1918, at Bangkok, Siam. 
°C. 
January 
58.9 
February 
61.3 
March 
63.7 
April 
65.7 
May 
65.7 
June 
64.6 
July 
65.9 
August 
63.8 
September 
63.3 
October 
62.1 
November 
60.4 
December 
59.1 
Mean for ten years 
62.7 
