 |
 
Monthly Normals of Meteorological Elements for July 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 |
1014.8 |
hPa |
30/7/1934 |
| Mean |
1005.5 |
hPa |
|
| Absolute Minimum |
975.8 |
hPa |
29/7/1896 |
| Mean Diurnal Range |
3.4 |
hPa |
|
| AIR TEMPERATURE |
Absolute Maximum |
35.7 |
deg. C |
25/7/1968 |
| Mean Daily Maximum |
31.3 |
deg. C |
|
| Mean |
28.7 |
deg. C |
|
| Mean Daily Minimum |
26.7 |
deg. C |
|
| Absolute Minimum |
21.7 |
deg. C |
30/7/1989 |
| RELATIVE HUMIDITY |
Mean |
81 |
% |
|
| Absolute Minimum |
43 |
% |
25/7/1968 |
| AMOUNT OF CLOUD |
68 |
% |
|
| RAINFALL |
Total |
374.4 |
mm |
|
| Duration |
80 |
hours |
|
Number of
Days with |
0.1 mm
or above |
17.77 |
|
|
25.0 mm
or above |
4.67 |
|
|
50.0 mm
or above |
2.40 |
|
|
| Maximum Hourly |
115.1 |
mm |
16/7/2006 |
| Maximum Daily |
534.1 |
mm |
19/7/1926 |
| Maximum Monthly |
1147.2 |
mm |
1994 |
| NUMBER OF DAYS WITH THUNDERSTORM |
5.90 |
|
|
| NUMBER OF DAYS WITH FOG (Visibility < 1000 m) |
0 |
|
|
SOIL TEMPERATURE
AT 0700 HOURS |
0.5 m |
29.8 |
deg. C |
|
| 1.0 m |
29.0 |
deg. C |
|
BRIGHT SUNSHINE
AT KING'S PARK |
Duration |
214.9 |
hours |
|
| Percentage of Possible |
52 |
% |
|
WIND
AT WAGLAN ISLAND |
Prevailing Direction |
230 |
degrees |
|
| Mean Speed |
21.9 |
km/h |
|
| Maximum Gust # |
158 |
km/h |
16/7/1973 |
SEA SURFACE TEMPERATURE
AT NORTH POINT AT 0700 HOURS ** |
26.7 |
deg. C |
|
Note : All measurements were made at the Hong Kong Observatory except where specified.
# 1953 - 2008
** 1975 - 2008
|
