 |
Monthly Normals and Extreme Values for Hong Kong in April
Monthly Normals of Meteorological Elements for April 1981-2010,
with Extreme Values between 1884-1939 and 1947-2011 for Hong Kong
| Meteorological Elements |
Date on which
extreme value
was recorded |
ATMOSPHERIC
PRESSURE |
Absolute Maximum |
1028.4 |
hPa |
9/4/1925 |
| Mean |
1012.9 |
hPa |
|
| Absolute Minimum |
999.9 |
hPa |
2/4/1924 |
| Mean Diurnal Range |
3.9 |
hPa |
|
| AIR TEMPERATURE |
Absolute Maximum |
33.4 |
deg. C |
27/4/1956 |
| Mean Daily Maximum |
25.0 |
deg. C |
|
| Mean |
22.6 |
deg. C |
|
| Mean Daily Minimum |
20.8 |
deg. C |
|
| Absolute Minimum |
9.9 |
deg. C |
5/4/1969 |
| RELATIVE HUMIDITY |
Mean |
83 |
% |
|
| Absolute Minimum |
22 |
% |
17/4/1922 |
| AMOUNT OF CLOUD |
81 |
% |
|
| RAINFALL |
Total |
174.7 |
mm |
|
| Duration |
99 |
hours |
|
Number of
Days with |
0.1 mm
or above |
12.00 |
|
|
25.0 mm
or above |
2.23 |
|
|
50.0 mm
or above |
1.10 |
|
|
| Maximum Hourly |
92.4 |
mm |
30/4/1975 |
| Maximum Daily |
237.4 |
mm |
19/4/2008 |
| Maximum Monthly |
547.7 |
mm |
2000 |
| NUMBER OF DAYS WITH THUNDERSTORM |
3.50 |
|
|
| NUMBER OF DAYS WITH FOG (Visibility < 1000 m) |
1.03 |
|
|
SOIL TEMPERATURE
AT 0700 HOURS |
0.5 m |
23.5 |
deg. C |
|
| 1.0 m |
22.9 |
deg. C |
|
BRIGHT SUNSHINE
AT KING'S PARK |
Duration |
101.7 |
hours |
|
| Percentage of Possible |
27 |
% |
|
WIND
AT WAGLAN ISLAND |
Prevailing Direction |
070 |
degrees |
|
| Mean Speed |
20.9 |
km/h |
|
| Maximum Gust # |
135 |
km/h |
11/4/1990 |
SEA SURFACE TEMPERATURE
AT NORTH POINT AT 0700 HOURS |
21.0 |
deg. C |
|
Note : All measurements were made at the Hong Kong Observatory except where specified.
# 1953 - 2011
|
