 |
 
Monthly Normals of Meteorological Elements for December 1971-2000,
with Extreme Values between 1884-1939 and 1947-2008 for Hong Kong
| Meteorological Elements |
Date on which
extreme value
was recorded |
ATMOSPHERIC
PRESSURE |
Absolute Maximum |
1033.5 |
hPa |
31/12/1913 |
| Mean |
1020.5 |
hPa |
|
| Absolute Minimum |
1004.6 |
hPa |
2/12/1974 |
| Mean Diurnal Range |
4.0 |
hPa |
|
| AIR TEMPERATURE |
Absolute Maximum |
28.7 |
deg. C |
1/12/1953 |
| Mean Daily Maximum |
20.3 |
deg. C |
|
| Mean |
17.8 |
deg. C |
|
| Mean Daily Minimum |
15.7 |
deg. C |
|
| Absolute Minimum |
4.3 |
deg. C |
14/12/1975 |
| RELATIVE HUMIDITY |
Mean |
69 |
% |
|
| Absolute Minimum |
14 |
% |
14/12/1898
31/12/1973 |
| AMOUNT OF CLOUD |
51 |
% |
|
| RAINFALL |
Total |
34.5 |
mm |
|
| Duration |
36 |
hours |
|
Number of
Days with |
0.1 mm
or above |
4.27 |
|
|
25.0 mm
or above |
0.30 |
|
|
50.0 mm
or above |
0.13 |
|
|
| Maximum Hourly |
51.7 |
mm |
9/12/1931 |
| Maximum Daily |
177.3 |
mm |
2/12/1974 |
| Maximum Monthly |
206.9 |
mm |
1974 |
| NUMBER OF DAYS WITH THUNDERSTORM |
0 |
|
|
| NUMBER OF DAYS WITH FOG (Visibility < 1000 m) |
0.03 |
|
|
SOIL TEMPERATURE
AT 0700 HOURS |
0.5 m |
20.5 |
deg. C |
|
| 1.0 m |
22.4 |
deg. C |
|
BRIGHT SUNSHINE
AT KING'S PARK |
Duration |
173.3 |
hours |
|
| Percentage of Possible |
52 |
% |
|
WIND
AT WAGLAN ISLAND |
Prevailing Direction |
070 |
degrees |
|
| Mean Speed |
26.5 |
km/h |
|
| Maximum Gust # |
108 |
km/h |
28/12/1991 |
SEA SURFACE TEMPERATURE
AT NORTH POINT AT 0700 HOURS ** |
19.8 |
deg. C |
|
Note : All measurements were made at the Hong Kong Observatory except where specified.
# 1953 - 2008
** 1975 - 2008
|
