Evapotranspiration in Hong Kong — Ramage 
83 
TABLE 1, continued 
Monthly Potential Evapotranspiration and Meteorological Observations made at King’s Park 
(22°19'N., 114"10'E., 213 FT. above m.s.l.) and at Royal Observatory (22°18'N., 114°10'E., 
109 FT. above m.s.l.) for the Five-Year Period, October 1951-September 1956, 
AND Also for October 1956-December 1956 
YEAR 
JAN. 
FEB. 
MAR. 
APR. 
MAY 
JUN. 
JUL. 
AUG. 
SEPT. 
OCT. 
NOV. 
DEC. 
5 -Year 
Mean 
60 
62 
65 
71 
79 
82 
83 
82 
81 
77 
70 
63 
1951 
68 
61 
50 
1952 
52 
55 
61 
68 
75 
77 
77 
77 
75 
68 
62 
47 
Mean dew 
1953 
51 
56 
60 
60 
71 
77 
77 
78 
74 
73 
61 
55 
point temperature 
(Royal Observatory) °F. 
1954 
57 
54 
53 
67 
74 
77 
77 
77 
73 
65 
59 
48 
1955 
41 
53 
62 
64 
72 
75 
77 
76 
76 
64 
53 
53 
1956 
46 
55 
59 
67 
73 
76 
77 
76 
72 
65 
52 
51 
5 - Year 
Mean 
49 
55 
59 
65 
73 
76 
77 
77 
74 
68 
59 
51 
1951 
197 
135 
189 
1952 
168 
78 
84 
114 
196 
152 
192 
177 
165 
240 
264 
138 
Sunshine duration 
1953 
130 
59 
75 
61 
125 
194 
275 
241 
114 
211 
141 
153 
(Royal Observatory) hours 
1954 
160 
116 
109 
69 
221 
159 
254 
206 
218 
256 
213 
150 
1955 
210 
147 
121 
174 
169 
137 
160 
208 
253 
289 
181 
229 
1956 
165 
66 
102 
175 
137 
214 
263 
229 
229 
242 
172 
164 
5 -Year 
Mean 
167 
93 
98 
119 
170 
171 
229 
212 
196 
239 
187 
172 
1951 
9.5 
10.9 
9.9 
1952 
9.6 
11.7 
13.2 
10.8 
8.9 
8.1 
8.1 
7.0 
9.0 
9.8 
7.5 
8.4 
Mean wind speed 
1953 
10.2 
11.5 
10.9 
11.3 
9.5 
8.8 
6.4 
5.7 
10.3 
9.5 
8.3 
9.4 
(Royal Observatory) knots 
1954 
9.3 
9.4 
9.1 
11.0 
6.7 
7.7 
5.9 
7.3 
10.5 
8.8 
10.6 
9.3 
1955 
9.4 
11.6 
11.1 
9.3 
8.0 
9.1 
6.8 
4.7 
6.5 
11.2 
11.6 
10.8 
1956 
9.3 
12.1 
12.5 
10.4 
9.5 
8.2 
6.6 
9.6 
9.1 
9.9 
9.4 
7.8 
5 -Year 
Mean 
9.6 
11.3 
11.4 
10.6 
8.5 
8.4 
6.8 
6.9 
9-1 
9.8 
9.8 
9.6 
months, grass surrounding the tanks could 
not be watered, while some flooding possibly 
occurred in moisture-surplus months. Since 
King’s Park is not subject to these mensural 
drawbacks they may account for some of the 
differences between the two curves. It seems 
reasonable then to conclude that the King’s 
Park site is probably a representative one. 
